Whispering Specter (NPH) from New Phyrexia, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Jason Felix
• Card Text:
  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 Whispering Specter deals combat damage to a player, you may sacrifice it. If you do, that player discards a card for each poison counter he or she has.