Mask of Immolation is a uncommon Artifact — Equipment card from Core Set 2020 (M20), collector number 151. Current market price: $0.24 (foil $0.56), TCGplayer market prices via Scryfall.
When this Equipment enters, create a 1/1 red Elemental creature token, then attach this Equipment to it. Equipped creature has "Sacrifice this creature: It deals 1 damage to any target." Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)