The Primordial One

When The Primordial One enter the battlefield,
exile all cards from all graveyard. The Primordial
One enter the battlefield with a number of +1/+1
counters equal to the number of creatures exiled
this way.
Whenever The Primordial One attack, Proliferate
Whenever another creature dies, exile it instead,
then put a +1/+1 counter on The Primordial One.