Godwyn, Prince of Death

When Godwyn enters the battlefield, mill 5,
then target opponent loses life equal to the
number of creature cards in your graveyard.
If you cast Godwyn from your hand, sacrifice it.
Godwyn can't attack or block.
Discard a card—You may cast target creature
card in your graveyard this turn. Activate this
ability only if Godwyn is in the graveyard.