Ambling Stormshell is a rare Creature — Turtle card from Tarkir: Dragonstorm Promos (PTDM), collector number 37p. Current market price: $0.24 (foil $0.18), TCGplayer market prices via Scryfall.
Ward {2} Whenever this creature attacks, put three stun counters on it and draw three cards. (If a permanent with a stun counter would become untapped, remove one from it instead.) Whenever you cast a Turtle spell, untap this creature.