Toxrill, the Corrosive (399) [Innistrad: Double Feature] Mystery then inflict 300 damage to

then inflict 300 damage to your opponent for each card sent to the opponent's GY by this effect

T: Target legendary creature gains first strike until end of turn

except the turn this card was sent to the Graveyard: You can banish this card from your Graveyard to target 1 face-up Effect Monster your opponent controls

But someone else had gotten there first

Number: DT07-EN036 Rarity: Ultra Rare Attribute Monster Type/Card Type: WIND Rock/Xyz/Effect Monster Level: 4 A / D: 1800 / 800 Description: 2 Level 4 monsters // Once per turn: You can detach 1 Xyz Material from this card

Toxrill, the Corrosive (399) [Innistrad: Double Feature] Mystery then inflict 300 damage toRarity: M #: 399 Card Type: Legendary Creature Slug Horror P T: 7 7 Description: At the beginning of each end step, put a slime counter on each creature you don't control. Creatures you don't control get 1 1 for each slime counter on them. Whenever a creature you don't control with a slime counter on it dies, creature a 1 1 black Slug creature token. UB, Sacrifice a Slug: Draw a card.