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Hmmm, let me try some random crap:

DD Libra:

Light attribute
Fiend type monster
8 stars
0000/0000

Effect:
This monster can be special summoned onto the field from your hand, graveyard or if removed by play by removing a light(fairy or fiend) and dark (fairy or fiend) from the field and/or graveyard.This monster gains the combined amount of attack and defense of both monsters.There can only be one DD Libra on the field.
If this card is specialed summon, depending on the combination of the creatures removed it gains the following effects:
1 light fiend and 1 dark fairy: this monster is not affected by your opponent's card effect's and you can remove one dark monster from your graveyard to special summon one removed light monster from the game to your side of the field(even your opponents).
1 light fairy and 1 dark fiend: this monster can't be destroyed by battle and by removing a light monster from your graveyard you can special summon a removed a dark monster from the game to your side of the field(even your opponents).
1 light and 1 dark fairy: destroy the entire field (exept this card)and discard all the cards in each players hand(including yours) and for each card sent to the graveyard you gain 500 life points.
1 light and 1 dark fiend: remove from play every card on the field (exept this one)and in each others hand and your opponent loses 300 life points for every card.
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Gluttonuos Archfiend:
level 3
1300/1300
Fiend
Dark

Tuner/effect: you can special summon this card from your hand as long as you have nothing on your side of the field and your opponent has at least 1 card on his side of the field.
This card may gain the following effects depending on how many cards he has on his side of the field:
1-3: you may increase the level of this card by the amount of cards you have in your hand or graveyard.
4-6:you may special summon a monster with a lower level than this card from your graveyard or if removed from play.
7-10: destroy an amount of cards on the field equal to half the combined level of monster cards you have on your side of the field and if this card is not used as a synchro material in the turn this card is special summoned and uses this effect then discard your hand, remove from play all the cards on your side of the field and graveyard and take 100 points of damage for every card removed from play.
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Naturia Gaia, Goddess of Life and Purity:
Synchro
level 10
1 tuner + 2 or more winged beast,beast,beast warrior,plant,rock or insect type monsters.
4000/4000

Effect:
As long as this card is on the field, every creature card you control becomes a beast,beast warrior,winged beast, insect, rock and plant.
If the effects of creatures you control activate by sacrifice,removing from play and/or destruction then you may return them to your hand or side of the field after the effect has resolved.
You may sacrifice any naturia monster on the field to negate the effects of any card in any speed(even counter traps).
If this card leaves the battlefield then you may send 5 naturia monsters to the graveyard or remove them from play to special summon this card in defense position to your side of the field(the cards used cannot be played during the duel again but you may play copies of those cards if you have them)

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Grand gadget factory:
Field spell

All gadget monsters on the field gain 500 attack and 400 defense points.
This card gets the following effects for the following gadgets that are summoned onto the field:
Green Gadget: you may destroy a spell or trap your opponent controls.
Red gadget: you may destroy a monster on your opponents side of the field.
Yellow gadget: you may draw a card for every gadget card you have on the field.

Other gadget cards: you may search your library for a green,yellow or red gadget and may do an additional normal summon by paying 500 lifepoints(you may do this once per turn)

-------------------------------------------------------------Final one before I explode:

Coqui, the grand frog of the wetlands:
aqua type
level 2
water
1800/0000

effect: this card can only be special summoned.
The only way to special summon this card is to remove 4 different types of frog cards(excluding frog the jam) from the graveyard or field.This card is considered a frog monster.
As long as this card is face up on the field no frog (except frog the jam) and toad monsters you control can't be destroyed and are uneffected by card effects that your opponent controls.
If this card destroys a monster by battle it can activate the following effects depending on how many frogs are on your side of the field:
1-2: You may look for a field spell in your graveyard or deck and add it to your hand or draw a card for every frog on your side of the field.
3-4:You may special summon a toad or frog monster from your deck,graveyard or hand to your side of the field and destroy one spell or trap on their side of the field.
5: This card may be treated as 3 des frogs until the end of your opponents third turn and you may gain life points equal to the amount of attack that the monster you destroyed had.

Dang these cards would be so broken. They would be limited to banned the day of release. Then again I would love gadgets to have there own field spell. twisted

you might not think this card is good but thik of it this way.

braker the magical warrior: destroy every spell/trap on your field
magical examplar: summon a power monster
magical marionette: destroy all ur opponents monsters
endymion master magician: special summon him and get a spell card back.
archenite: blow up the field
etc: XD

Bursting Wolf Tribe

Level 3

Type- Beast

effect-

You may have as meny copies of this card perdeck as you wish.

when this monster is destroyed and sent to the graveyard you may special summon 1 from your hand or deck. When this card is special summoned from your hand or deck destroy it and special summon 1 other Bursting Wolf Tribe from your graveyard.

ATK 100 / DEF 100

It seems useless, but think about how easy it would be to draw burn cards if your deck went down to 15 or less cards in a few turns.

mrgreen

Aries
-Normal Spell
--Destroy one defense-position monster on your opponent's side of the field. Summon one "Ram" token (level 4, beast, 1900atk 1500def) in face up attack position.


Taurus
-Quick-Play Spell
--Select one monster on your opponent's side of the field. That monster cannot attack this turn.


Gemini
-Effect Monster
-Light
-Level 4
-Fairy
0atk / 0def
--Once per turn, look at your opponent's hand and select one monster in it. Until the end of the turn, that card stays revealed and this card's name, effect, attack, defense, and level are treated as that card's.


Cancer
-Counter Trap
--Activate only when an opponent's monster declares an attack. Destroy all face-up monsters on your opponent's side of the field. You can remove this card from play along with one other "Cancer" card in your hand or graveyard to destroy all monsters on your opponent's field.


Leo
-Effect Monster
-Light
-Level 5
-Beast
2000atk / 1000def
--Once per turn, if this card is in your graveyard and you control no monsters, you can search for one "Leo" card in your deck and special summon it in face-up attack position.


Virgo
-Effect Monster
-Light
-Level 4
-Fairy
1000atk / 2000def
--As long as this card remains in face-up attack position, neither you nor your opponent may declare an attack. Switch this card to face-up defense position during the end-phase of your opponent's turn. If this card's battle position was changed by this effect, switch this card to face-up attack position during the end phase of your opponent's next turn.

(there would be a ruling basically stating both of this card's effects kick in at the same time so it can actually just switches from attack to defense and vice-versa ever time the opponent ends their turn)


Libra
-Permanent Spell
--The opponent must reveal their first draw during their draw phase. Before adding it to their hand, decide whether the card will enter their hand or be replaced by the card currently on top of the deck. This effect cannot be countered.


Scorpio
-Effect Monster
-Light
-Level 2
-Beast
200atk /2000def
--Once-per-turn, you can flip this card into face-down defense position. When this card is flipped face-up, destroy one car on your opponent's side of the field, regardless of position. If this card is attacked while face-down and flipped face-up, destroy the attacking monster before damage calculation.

(Ruling: if the second effect activates, you miss the timing on the first effect)


Sagittarius
-Effect Monster
-Light
-Level 7
-Beast-Warrior
2500atk / 2000def
--If your opponent declares an attack while you control no monsters, you can special summon this card from your hand. If this card is special summoned by this effect, it can attack your opponent directly.


Capricorn
-Effect Monster
-Light
-Level 4
-Beast
1000atk / 2000def
--This card cannot be destroyed by battle. When this card is normal summoned, it is chanced to face-up defense position. If this card is attacked while in face-up defense position, it is switched to face-up attack position, after damage calculation, and its attack and defense points are switched until the end of your next turn.


Aquarius
-Permanent Spell
--Once per turn, you can pay the following costs to search for the following cards in your deck and place them in your hand:
---> Pay 1000 Lifepoints: Aries, Leo, Sagittarius
---> Sacrifice one Face-Up Monster: Taurus, Virgo, Capricorn
---> Place one monster you control on the bottom of your deck: Gemini, Libra
---> Discard two cards: Cancer, Scorpius, Pisces


Pisces
-Effect Monster
-Light
-Level 2
-Fish
200atk / 200def
--When this card is normal or special summoned, you can special summon as many "Pisces" as possible from your hand, deck, or graveyard.

(would probably be semi-limited, because of perfect synchro fodder)

I would make a whole archetype, and I will MWahaha.

Name: Lakota: Skin Walker
Attribute: Earth
Type: Fiend
Level: 7
Attack: 2500
Defense: 1400
Effect: This card can only be special summoned by tributing 1 "Lakota" monster on your side of the field, and 2 spell cards from your hand or field. While this card is on the field no cards can be synchro summoned.

Name: Lakota: Ghost Walker
Attribute: Dark
Type: Fiend
Level: 5
Attack: 0
Defense: 0
Effect: When this card is tribute summoned take control of one monster on your opponents side of the field for as long as this card remains face-up on your side of the field. By discarding 1 spell card this card can not be destroyed by battle.

Name: Lakota: Wind Walker
Attribute: Wind
Type: Fairy
Level: 4
Attack: 1700
Defense:1000
Effect: Flip: return one spell card from your graveyard to your deck, then shuffle your deck.

Name: Lakota: Coyote
Attribute: Earth
Type: Beast
Level: 3
Attack: 900
Defense: 1200
Effect: When this card is destroyed as a result of battle and sent to the graveyard add one "Medicine Wheel" from your graveyard to your deck. Then shuffle your deck.

Name: Lakota: Windigo
Attribute: Dark
Type: Fiend
Level: 4
Attack: 1500
Defense: 100
Effect: You can tribute 1 Lakota monster on your side of the field to activate 1 of the following effects depending on its level.
*1-5: draw 1 card.
*6: destroy all spell and trap cards on your opponents side of the field.
*7-8: draw 2 cards.

Name: Lakota: Medicine Man
Attribute: Light
Type: Spellcaster
Level: 6
Attack: 2000
Defense: 2000
Effect: You can discard 1 "Medicine Wheel" to activate one of the following effects.
*Negate a monster effect, trap, or spell card and destroy it.
*Special summon 1 Lakota monster from your graveyard.
Only one "Medicine Wheel" can be discarded per turn.

Name: Lakota: Brave
Attribute: Earth
Type: Warrior
Level: 4
Attack: 1700
Defense: 300
Effect:When this card attacks a defense position and its attack is higher than the defense position monsters defense, inflict the difference as battle damage.

Name: Lakota: Shaman
Attribute:Light
Type:Spellcaster
Level: 4
Attack: 1600
Defense: 500
Effect: By discarding one spell card from your hand you can change the battle position of one card your opponent controls.

Name: Lakota: Great Mother
Attribute: Light
Type: Fairy
Level: 8
Attack: 3000
Defense: 1700
Effect: This card can only be special summoned by removing from play 3 "Medicine Wheels". Increase the attack of all Lakota monsters by 300. No trap cards can be activated during the battle phase.

Name: Medicine Wheel
Attribute: Spell
Type: normal
Level: N/A
Attack: N/A
Defense: N/A
Effect: This card is returned to your deck when a Lakota monster is destroyed by the effect of a trap, or magic card.

Name: Maize
Attribute: Spell
Type: Continuous
Level: N/A
Attack: N/A
Defense: N/A
Effect: during your end phase increase your life points by x200 the number of Lakota Monsters you control.

Name: Ghost Dance
Attribute: trap
Type: Counter
Level: N/A
Attack: N/A
Defense N/A
Effect: When your opponent declares an attack take control of the attacking monster until the end phase.

Name: Dream Catcher
Attribute: Spell
Type: Quick-Play
Level: N/A
Attack: N/A
Defense: N/A
Effect: Negate the effect of a spell, or trap that would destroy a Lakota Monster on your side of the field.

Over powered I think, but I like it.

Mechanization
Type: Trap
Icon: ---
Activate only when an Opponants Monster declares a Direct attack on your life points. Send any number of rock type monster from your deck to the graveyard and special summon one machine type monster from your hand or deck with a level equal to the number of Rock monsters sent to the graveyard by this effect.

Mineral Excavator
Attribute: EARTH
Type: Machine/Effect
Level: 8
ATK: 0
DEF: 2500
This card Cannot be Specisl summoned from the Graveyard. If this card would be destroyed, you can remove from play one rock type monster in your graveyard instead. Once per turn, you can special summon one of your Removed from Play Rock Monsters to your side of the field.