Leviathan [The Dark] SV81 the player who activated this

the player who activated this card takes damage to the original ATK of the monster (at the time it was Summoned)

you can also Xyz Summon "Divine Arsenal AA-ZEUS - Sky Thunder" by using 1 Xyz Monster you control as material

if this card in face-up Attack Position

each other creature you control gets +1/+0 until end of turn

Leviathan [The Dark] SV81 the player who activated thisSet: The Dark Type: Creature Leviathan Rarity: Rare Cost: {5}{U}{U}{U}{U} Trample Leviathan enters the battlefield tapped and doesn't untap during your untap step. At the beginning of your upkeep, you may sacrifice two Islands. If you do, untap Leviathan. Leviathan can't attack unless you sacrifice two Islands. (This cost is paid as attackers are declared.)