Mauz, Eternal Tormentor

Haste, Trample, Flying
When Mauz attacks look at the top four cards
of your library, then put them back in any
order.
When Mauz becomes untapped you may draw
a card, then mill three cards. When you do if
one or more instant or sorcery cards were put
into your graveyard this way put that many
+1/+1 counters on Mauz.