Archipelagore (IKO 283)

Creature — Leviathan • Mana cost: {5}{U}{U} • Ikoria: Lair of Behemoths • Uncommon

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.

Illustrated by Kev Walker.