Archipelagore is a uncommon Creature — Leviathan card from Ikoria: Lair of Behemoths (IKO), collector number 283. Current market price: $0.24 (foil $0.32), TCGplayer market prices via Scryfall.
Mutate {5}{U} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.) Whenever this creature mutates, tap up to X target creatures, where X is the number of times this creature has mutated. Those creatures don't untap during their controller's next untap step.