Oni Possession is a uncommon Enchantment — Aura card from Champions of Kamigawa (CHK), collector number 135. Current market price: $0.16 (foil $0.75), TCGplayer market prices via Scryfall.
Enchant creature At the beginning of your upkeep, sacrifice a creature. Enchanted creature gets +3/+3 and has trample. Enchanted creature is a Demon Spirit.