Mil Mordos, Azrael's Protege

This creature enters the battlefield with an additional X +1/+1 counters on it.
When you cast Mil Mordos, Azrael's Protege, tap
X lands. They don't untap during their
controllers next untap step.
Martyr: When this creature leaves the battlefield,
draw X cards, where X is it's toughness.
"Azrael may have been a monster, but his skill as a teacher is evident."
-Erax