Duskmantle Seer is a mythic Creature — Vampire Wizard card from Gatecrash (GTC), collector number 159. Current market price: $0.38 (foil $0.97), TCGplayer market prices via Scryfall.
Flying At the beginning of your upkeep, each player reveals the top card of their library, loses life equal to that card's mana value, then puts it into their hand.