Illuna, Apex of Wishes

Most of the mythic mutate legends stop at "big body plus a trigger." This one weaponizes the trigger itself. Mutate stacks this creature onto a non-Human you own during your main phase, and the resulting pile inherits every ability from the cards beneath it: the mechanic rewards incremental board-building rather than skipping mana costs wholesale. But each mutation here exiles cards until it hits a nonland permanent, then drops that card onto the battlefield or into your hand, which converts a repeatable value action into a repeatable cheat-into-play engine. The clause ignores both the price and the card type of whatever it finds: a planeswalker, an enormous creature, an artifact, all fair game so long as it is a permanent. Because the ability fires on any mutation rather than only the first, adding another mutate creature to the stack triggers it again, and any effect that re-mutates the pile chains more free permanents. The gamble is honest because you flip until you hit: a deck stuffed with expensive permanents rewards the swing, while a lean list risks surrendering whatever happens to be sitting on top. The 6/6 flying trample body is almost incidental. The reason to build a five-mana three-color legend around this creature is the free-permanent lottery it runs every time it climbs onto another body.