Dreadhorde Invasion

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 lifeline
until end of turn.