Xarktyyhrusz, Greatest God

You can't cast your commander unless you control three or more cultleaders.

Flying, Trample, Indestructible, Hivemind 4

As long as this creature is on the battlefield or the command zone, you may pay mana costs to cast spells with your life points.
Whenever you cast a spell, raise a counter of any kind on target permanent or player.

Power of the Dark Lord-Permanents you control
have annihilator 1.