Vow of Torment is a uncommon Enchantment — Aura card from Commander Legends (CMR), collector number 159. Current market price: $0.29 (foil $0.40), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets +2/+2, has menace, and can't attack you or planeswalkers you control. (It can't be blocked except by two or more creatures.)