Ghoulengine

Menace, trample
Whenever Ghoulengine would be crewed by five
or more Zombies, you may exile up to one target
card from a graveyard. If you do, create a 2/2
black Zombie creature token with decayed.
Zombie Crew 1 (Tap any number of Zombie
creatures you control with total power 1 or more: This Vehicle becomes an artifact creature until end of turn.)