Cautery Sliver is a uncommon Creature — Sliver card from Planar Chaos (PLC), collector number 154. Current market price: $0.26 (foil $14.99), TCGplayer market prices via Scryfall.
All Slivers have "{1}, Sacrifice this permanent: This permanent deals 1 damage to any target." All Slivers have "{1}, Sacrifice this permanent: Prevent the next 1 damage that would be dealt to target player, planeswalker, or Sliver creature this turn."