Ancestral Vengeance is a common Enchantment — Aura card from Fate Reforged (FRF), collector number 61. Current market price: $0.04 (foil $0.40), TCGplayer market prices via Scryfall.
Enchant creature When this Aura enters, put a +1/+1 counter on target creature you control. Enchanted creature gets -1/-1.