Demon King Fomortiis

As this creature transforms into Olag,
Ludevic’s Hubris, it becomes a copy of a creature card exiled with it, except its name is Olag, Ludevic’s Hubris, it’s 4/4, and it’s a legendary blue and black Zombie in addition
to its other colors and types. Put a number of +1/+1 counters on Olag equal to the number of creature cards exiled with it.