Elemental HERO Absolute Zero (OP05-EN023) Common / Short Print Unlimited

1 "HERO" monster + 1 WATER monster
Must be Fusion Summoned and cannot be Special Summoned by other ways. This card gains 500 ATK for each face-up WATER monster on the field, except "Elemental HERO Absolute Zero". When this card leaves the field: Destroy all monsters your opponent controls.