King of the damned

When King of the damned enters the battlefield,
you can pay {x} more where {x} is the number of
creatures you can Unearth from your graveyard.
You may put a +1 / +1 counter on the King of
the damned for every creature banished.
{x}: Pick a creature from your graveyard
that costs {x} mana of the same color of the one
spent and Unearth it.