Cthulu, World Ender

When Cthulu enters the battlefield,
each player destroys X creatures they controls,
except for Cthulu, World Ender.
{u/b}{u/b}{u/b}{u/b}{u/b}:
Exile target creature from any graveyard.
While Cthulu, World Ender is on under your control,
you may not cast creature spells.
"We prayed for the day of His return.
Now, we pay for our arrogance."