Oni Possession 
Enchantment — Aura
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.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL