Whispering Specter is a uncommon Creature — Phyrexian Specter card from New Phyrexia (NPH), collector number 77. Current market price: $1.96 (foil $5.92), TCGplayer market prices via Scryfall.
Flying Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.) Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, that player discards a card for each poison counter they have.