Azax-Azog, Oxidda Overlord

First strike, deathtouch, menace, haste
At the beginning of combat on your turn, each
player sacrifices a permanent and you get that
many experience counters. Create a number of
1/1 black and red Skeleton creature tokens with
haste and "{b}: Regenerate this creature" equal to
the number of experience counters you have; tap
Azax-Azog, Oxidda Overlord unless you have 17.
(experience counters)
{ut}: You lose 10 life.