Mirko Vosk, Mind Drinker is a rare Legendary Creature — Vampire card from GRN Guild Kit (GK1), collector number 17. Current market price: $0.73, TCGplayer market prices via Scryfall.
Flying Whenever Mirko Vosk deals combat damage to a player, that player reveals cards from the top of their library until they reveal four land cards, then puts those cards into their graveyard.