Planar Arbiter

Planar Arbiter costs {2}{w} more to cast for each
creature card in your graveyard.

You may cast Planar Arbiter from exile.

When Planar Arbiter enters the battlefield, if it
wasn't cast from exile, exile it.
Pay 2 life, Sacrifice three creatures: Return target
creature card from your graveyard to the
battlefield tapped.