Ice Beast Zerofyne [LTGY-EN049] Rare

2 Level 4 Winged Beast-Type monsters Once per turn: You can detach 1 Xyz Material from this card; negate the effects of all face-up cards your opponent currently controls, and if you do, this card gains 300 ATK for each face-up card currently on the field, except this card (these effects are applied until your next Standby Phase).