Spell Power Mastery [SR08-EN022] Super Rare 123a change that opponent's monster's ATK

change that opponent's monster's ATK to 0

you can add the selected Trap Card to your hand instead

You can only use each of the following effects of "World Gears of Theurlogical Demiurgy" once per turn

gain 400 Life Points for each Dinosaur-Type monster banished to activate this card

Set: Black & White: Plasma Blast Type: Dragon Rarity: Ultra Rare Retreat cost: Colorless

Spell Power Mastery [SR08-EN022] Super Rare 123a change that opponent's monster's ATKSet: Structure Deck: Order of the Spellcasters Card type: Normal Spell Rarity: Super Rare Add 1 "Endymion" card from your Deck to your hand, then you can count the number of "Spell Power Mastery" and "Spell Power Grasp" you control and or have in your GY, and place that many Spell Counters among card(s) you control that you can place a Spell Counter on. You can only activate 1 "Spell Power Mastery" per turn.