Vengeful Ancestor is a rare Creature — Spirit Dragon card from Tarkir: Dragonstorm Commander (TDC), collector number 242. Current market price: $0.49, TCGplayer market prices via Scryfall.
Flying Whenever this creature enters or attacks, goad target creature. (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.) Whenever a goaded creature attacks, it deals 1 damage to its controller.