The Great Henge [Throne of Eldraine Prerelease Promos] Champion Pack 6 Leviathan can't attack unless you

Leviathan can't attack unless you sacrifice two Islands

and Iliona—the Vendilion clique—on the gravest of tasks

Set: Crossroads of Chaos Card type: Synchro/Effect Monster Rarity: Ultra Rare Attack: 2400 Defense: 1800 1 Tuner + 1 or more non-Tuner monsters When this card is Synchro Summoned

Set: Kaladesh Prerelease Promos Type: Artifact Creature — Construct Rarity: Mythic Cost: {3}{W}{W} Vigilance

Set: Amonkhet Invocations Type: Legendary Creature — God Rarity: Mythic Cost: {4}{U}{R} Flying

The Great Henge [Throne of Eldraine Prerelease Promos] Champion Pack 6 Leviathan can't attack unless youSet: Throne of Eldraine Prerelease Promos Type: Legendary Artifact Rarity: Mythic Cost: {7}{G}{G} This spell costs {X} less to cast, where X is the greatest power among creatures you control. {T}: Add {G}{G}. You gain 2 life. Whenever a nontoken creature enters the battlefield under your control, put a +1 +1 counter on it and draw a card.