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

change that opponent's monster's ATK to 0

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

Set: Neo Genesis 1st Edition Type: Water Rarity: Uncommon Retreat cost: Colorless

Set: Battle Pack: Epic Dawn Card type: Toon Monster Rarity: Starfoil Rare Attack: 1900 Defense: 900 Cannot attack the turn it is Summoned

Set: Structure Deck: Fury from the Deep Card type: Effect Monster Rarity: Common Attack: 2600 Defense: 1500 Send "Umi" on your side of the field to the Graveyard to destroy all cards on the field except this card

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.