Mound of the Formless Undead

Mound of the Formless Undead enters the battlefield with X +1/+1 counters on it, where
X must be greater than or equal to the amount
of Undead creatures in your graveyard.

"It seems the stitchers have gotten lazy."
"Not lazy. Efficient, when they are formless
you can mold them to any situation."
-A conversation between Necromancers