Zygon Infiltrator

Creature — Alien Shapeshifter Soldier3/2$0.28

Body-print — {2}{U}: Tap another target creature and put a stun counter on it. This creature becomes a copy of that creature for as long as that creature remains tapped. Activate only as a sorcery. (If a permanent with a stun counter would become untapped, remove one from it instead.)

Legal in Commander

View Zygon Infiltrator on Scryfall