Prikimkuuth, Crypt Dragon

flying
As an additional cost, if you can sacrifice 12 or
more slaves, sacrifice them, if you cant, put four
0/1 slaves tokens onto the battlefield, and return Prikimkuuth, Crypt Dragon to your hand.
At the begging of your upkeep, put a 0/1 slave
onto the battlefield.
Whenever a slave you control dies, stage 1.