Mausoleum Wanderer is a rare Creature — Spirit card from Eldritch Moon (EMN), collector number 69. Current market price: $0.35 (foil $1.18), TCGplayer market prices via Scryfall.
Flying Whenever another Spirit you control enters, this creature gets +1/+1 until end of turn. Sacrifice this creature: Counter target instant or sorcery spell unless its controller pays {X}, where X is this creature's power.