Graveblade Marauder is a rare Creature — Human Warrior card from Magic Origins (ORI), collector number 101. Current market price: $0.16 (foil $0.43), TCGplayer market prices via Scryfall.
Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.) Whenever this creature deals combat damage to a player, that player loses life equal to the number of creature cards in your graveyard.