Theory

Theory Nerd
Level 4 FIRE Spellcaster/Normal
2000/0
A nerdy scientist who pays attention to detail in his research papers. There is no grammatical, spelling or context errors in his research work.

Theory of Information
Level 8 WIND Spellcaster/Bigbang/Effect
2500/0
2+ Positive monsters, including "Theory Nerd"
Once per turn, during the Damage Step, when a Spell/Trap Card, or monster effect, is activated (Quick Effect): You can negate the activation. If this card in your possession is sent to the GY by an opponent's card: You can Special Summon 1 "Theory Nerd" from your hand, Deck, or GY.

Theory of Economic Games
Level 8 WIND Spellcaster/Bigbang/Effect
2400/0
2+ Positive monsters, including "Theory Nerd"
Once per turn, when your opponent activates a Normal Spell/Trap Card or monster effect (Quick Effect): You can activate this effect; the activated effect becomes "1 face-up monster your opponent controls gains 500 ATK until the end of this turn". If this card in your possession is sent to the GY by an opponent's card: You can Special Summon 1 "Theory Nerd" from your hand, Deck, or GY.

Theory of Oxygen
Level 8 WIND Spellcaster/Bigbang/Effect
2300/0
2+ Positive monsters, including "Theory Nerd"
Once per turn, before damage calculation, if this card attacks an opponent's monster: You can destroy that monster, and if you do, inflict damage to your opponent equal to the destroyed monster's original ATK. If this card in your possession is sent to the GY by an opponent's card: You can Special Summon 1 "Theory Nerd" from your hand, Deck, or GY.

Theory of Statistics
Level 8 WATER Spellcaster/Bigbang/Effect
2200/0
2+ Positive monsters, including "Theory Nerd"
Once per turn (Quick Effect): You can target 1 face-up monster on the field and 1 monster in your GY; the ATK of the first target becomes equal to the other target's, until the end of this turn. If this card in your possession is sent to the GY by an opponent's card: You can Special Summon 1 "Theory Nerd" from your hand, Deck, or GY.

Theory of Spatial Relativity
Level 9 LIGHT Spellcaster/Bigbang/Effect
2800/0
3+ Positive monsters, including "Theory Nerd"
Once per turn: You can target 1 monster your opponent controls; destroy it. If this card in your possession is sent to the GY by an opponent's card: You can Special Summon 1 "Theory Nerd" from your hand, Deck, or GY, and if you do, Special Summon 1 "Theory Token" (Spellcaster/EARTH/Level 1/ATK 500/DEF 0).

Theory of General Relativity
Level 9 DARK Spellcaster/Bigbang/Effect
3000/0
3+ Positive monsters, including "Theory Nerd"
If this card battles, your opponent cannot activate Spell/Trap Cards until the end of the Damage Step. If this card attacks a Defense Position monster, inflict piercing battle damage. If this card in your possession is sent to the GY by an opponent's card: You can Special Summon 1 "Theory Nerd" from your hand, Deck, or GY, and if you do, Special Summon 1 "Theory Token" (Spellcaster/EARTH/Level 1/ATK 500/DEF 0).

Theory of Quantum Mechanics
Level 9 WIND Spellcaster/Bigbang/Effect
2900/0
3+ Positive monsters, including "Theory Nerd"
Your opponent must pay 600 LP to activate cards or effects. When this card destroys an opponent's monster by battle and sends it to the GY: You can Special Summon that monster to your field. If this card in your possession is sent to the GY by an opponent's card: You can Special Summon 1 "Theory Nerd" from your hand, Deck, or GY, and if you do, Special Summon 1 "Theory Token" (Spellcaster/EARTH/Level 1/ATK 500/DEF 0).

Theory of Natural Selection
Level 10 EARTH Spellcaster/Bigbang/Effect
3200/0
4+ Positive monsters, including "Theory Nerd"
All monsters on the field lose ATK equal to their original DEF. This card can attack a number of times each Battle Phase, up to the number of "Theory Nerd" in your GY +1. Unaffected by your opponent's Spell/Trap effects. If this card in your possession is sent to the GY by an opponent's card: You can Special Summon 1 "Theory Nerd" from your hand, Deck, or GY, and if you do, Special Summon 2 "Theory Tokens" (Spellcaster/EARTH/Level 1/ATK 500/DEF 0).

Theory of Heliocentrism
Level 10 LIGHT Spellcaster/Bigbang/Effect
3200/0
4+ Positive monsters, including "Theory Nerd"
All monsters on the field lose ATK equal to their original DEF. Any monster sent to your opponent's GY is banished instead. Unaffected by your opponent's monster effects. If this card in your possession is sent to the GY by an opponent's card: You can Special Summon 1 "Theory Nerd" from your hand, Deck, or GY, and if you do, Special Summon 2 "Theory Tokens" (Spellcaster/EARTH/Level 1/ATK 500/DEF 0).

Theory Wand
Equip Spell
Special Summon 1 "Theory Token" (Spellcaster/EARTH/Level 1/ATK 500/DEF 0), and if you do, equip it with this card, then you can add 1 "Theory Nerd" from your Deck to your hand. During the End Phase, if this card is in the GY because it was sent there from the Spell & Trap Zone this turn while face-up: You can target 1 Spell/Trap your opponent controls; destroy it. You can only use each effect of "Theory Wand" once per turn.

Theory Staff
Equip Spell
Special Summon 1 "Theory Token" (Spellcaster/EARTH/Level 1/ATK 500/DEF 0), and if you do, equip it with this card, then you can add 1 "Theory Nerd" from your GY to your hand. During the End Phase, if this card is in the GY because it was sent there from the Spell & Trap Zone this turn while face-up: You can draw 1 card. You can only use each effect of "Theory Staff" once per turn.

Theory Hat
Equip Spell
Special Summon 1 "Theory Token" (Spellcaster/EARTH/Level 1/ATK 500/DEF 0), and if you do, equip it with this card, then you can add 1 "Theory" Spell/Trap from your Deck to your hand, except "Theory Hat". During the End Phase, if this card is in the GY because it was sent there from the Spell & Trap Zone this turn while face-up: You can Special Summon 1 "Theory Token". You can only use each effect of "Theory Hat" once per turn.

Supernatural Theory
Normal Trap
Special Summon 1 "Theory Nerd" from your hand, Deck, or GY, then you can Special Summon as many "Theory Tokens" (Spellcaster/EARTH/Level 1/ATK 500/DEF 0) as possible, but they cannot be Tributed. You cannot Special Summon monsters from the Extra Deck while a "Theory Token" is in a Monster Zone, except Bigbang Monsters.

Theory Logic
Counter Trap
When your opponent Normal or Special Summons a monster(s), while you control a "Theory" monster: Negate the Summon, and if you do, shuffle that monster into the Deck. You can only activate 1 "Theory Logic" per turn.