Eye of Duskmantle is a rare Creature — Eye card from Murders at Karlov Manor Commander (MKC), collector number 337. Current market price: $0.26, TCGplayer market prices via Scryfall.
Flying, lifelink You may play lands and cast spells from among cards in your graveyard you've surveilled this turn. If you cast a spell this way, you pay life equal to its mana value rather than paying its mana cost.