When this creature enters,
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.).
Zombie tokens you control have
hexproof (This permanent can't be the target of spells or abilities your opponents control.) and
menace (This creature can't be blocked except by two or more creatures.).