Scharok, God of Mayhem

Scharok, God of Mayhem enters the
battlefield with X +1/+1 counters, where
X is the amount of mana spent to cast it.
When Scharok, God of Mayhem attacks,
each opponent loses 1 life for each +1/+1
counter on Scharok, God of Mayhem
If Scharok, God of Mayhem would be put into
a graveyard or exile from the battlefield, you may
put it third from the top of your library.