Rowdy Snowballers is a common Creature — Human Peasant Ally card from Avatar: The Last Airbender (TLA), collector number 68. Current market price: $0.10 (foil $0.20), TCGplayer market prices via Scryfall.
When this creature enters, tap target creature an opponent controls and put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.)