Geist of the Lonely Vigil is a uncommon Creature — Spirit Cleric card from Eldritch Moon (EMN), collector number 27. Current market price: $0.17 (foil $0.38), TCGplayer market prices via Scryfall.
Defender, flying Delirium — This creature can attack as though it didn't have defender as long as there are four or more card types among cards in your graveyard.