Trishula, Dragon of the Ice Barrier [AP08-EN001] Ultimate Rare Ultra Rare then if its ATK has

then if its ATK has been reduced to 0 as a result

When this card inflicts battle damage to your opponent: You can Special Summon 2 Tuner monsters with the same Level (1 from your Deck and 1 from your Graveyard) in Defense Position

If your opponent doesn't control a Toon Monster

Neither player can Special Summon monsters

but its original ATK becomes 0

Trishula, Dragon of the Ice Barrier [AP08-EN001] Ultimate Rare Ultra Rare then if its ATK hasSet: Astral Pack 8 Card type: Synchro Effect Monster Rarity: Ultimate Rare Attack: 2700 Defense: 2000 1 Tuner + 2 or more non Tuner monsters When this card is Synchro Summoned: You can banish up to 1 card each from your opponent's hand, field, and Graveyard. (The card in the hand is chosen at random.)