Elemental HERO Absolute Zero (Platinum Secret Rare) (RA03-EN231) - Quarter Century Bonanza 1st Edition

1 "HERO" monster + 1 WATER monster
Must be Fusion Summoned. Gains 500 ATK for each WATER monster on the field, except "Elemental HERO Absolute Zero". If this card leaves the field: Destroy all monsters your opponent controls.