Mask of Memory is a uncommon Artifact — Equipment card from Planechase (HOP), collector number 119. Current market price: $0.53, TCGplayer market prices via Scryfall.
Whenever equipped creature deals combat damage to a player, you may draw two cards. If you do, discard a card. Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)