Grathados, Risen Calamity

When you cast Grathados, destroy all creatures,
they can't be regenerated. You draw a card for
each nontoken creature you controlled destroyed
this way.
When Grathados enters the battlefield, put X
+1/+1 counters on it, where X is the greatest
power of a nontoken creature which died this
turn, then return a creature card from your
graveyard to your hand.