Bladeback Sliver is a common Creature — Sliver card from Modern Horizons (MH1), collector number 119. Current market price: $0.17 (foil $0.68), TCGplayer market prices via Scryfall.
Hellbent — As long as you have no cards in hand, Sliver creatures you control have "{T}: This creature deals 1 damage to target player or planeswalker."