Virulent Sliver is a common Creature — Sliver card from Time Spiral Remastered (TSR), collector number 246. Current market price: $0.36 (foil $1.17), TCGplayer market prices via Scryfall.
All Sliver creatures have poisonous 1. (Whenever a Sliver deals combat damage to a player, that player gets a poison counter. A player with ten or more poison counters loses the game.)