Invading Manticore is a common Creature — Zombie Manticore card from War of the Spark (WAR), collector number 134. Current market price: $0.14 (foil $0.09), TCGplayer market prices via Scryfall.
When this creature enters, amass Zombies 2. (Put two +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.)