Constrictor Sage is a uncommon Creature — Snake Wizard card from Tarkir: Dragonstorm (TDM), collector number 39. Current market price: $0.11 (foil $0.24), 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.) Renew — {2}{U}, Exile this card from your graveyard: Tap target creature an opponent controls and put a stun counter on it. Activate only as a sorcery.