Ossification is a uncommon Enchantment — Aura card from Phyrexia: All Will Be One (ONE), collector number 277. Current market price: $0.43 (foil $0.73), TCGplayer market prices via Scryfall.
Enchant basic land you control When this Aura enters, exile target creature or planeswalker an opponent controls until this Aura leaves the battlefield.