Infernal Phantom is a uncommon Creature — Spirit card from Duskmourn: House of Horror (DSK), collector number 141. Current market price: $0.15 (foil $0.24), TCGplayer market prices via Scryfall.
Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gets +2/+0 until end of turn. When this creature dies, it deals damage equal to its power to any target.