Army of the Decayed

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)

Army of the Decayed enters with X +1/+1 counters on it.

When Army of the Decayed dies, amass Zombies X. (Put X +1/+1 counters 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.)