Dreadhorde Invasion (CMM) from Commander Masters, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Stanton Feng
• Card Text:
  At the beginning of your upkeep, you lose 1 life and amass Zombies 1. (Put a +1/+1 counter on an Army you control. It's also a Zombie. If you don’t control an army, create a 0/0 black Zombie Army creature token first.)
  Whenever a Zombie token you control with power 6 or greater attacks, it gains lifelink until end of turn.