Rancor is a common Enchantment — Aura card from Duel Decks: Garruk vs. Liliana (DDD), collector number 15. Current market price: $1.34, TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets +2/+0 and has trample. When this Aura is put into a graveyard from the battlefield, return it to its owner's hand.