Poultice Sliver is a uncommon Creature — Sliver card from Time Spiral Remastered (TSR), collector number 33. Current market price: $0.30 (foil $1.13), TCGplayer market prices via Scryfall.
All Slivers have "{2}, {T}: Regenerate target Sliver." (The next time that Sliver would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)