Doomskar Warrior is a rare Creature — Human Warrior card from March of the Machine Promos (PMOM), collector number 185p. Current market price: $0.30 (foil $0.09), TCGplayer market prices via Scryfall.
Backup 1 Trample Whenever this creature deals combat damage to a player or battle, look at that many cards from the top of your library. You may reveal a creature or land card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.