Takklemaggot

Enchant creature

At the beginning of the upkeep of enchanted creature's controller, put a -1/-1 counter on that creature.

When enchanted creature dies, that creature's controller chooses a creature that Takklemaggot could enchant. If the player does, return Takklemaggot to the battlefield under your control attached to that creature. If they don't, return Takklemaggot to the battlefield under your control. It loses "enchant creature" and gains Enchant Player "At the beginning of that player's upkeep