Maru, Takenuma's Wrath

Flying, menace
When Maru, Takenuma's Wrath enters the battlefield, each player discards his or her hand.
Then put a +1/+1 counter on Maru for each creature card in your opponents graveyards.
Remove three +1/+1 counters from Maru, Takenuma's Wrath: Search your library for a card and put it into your hand, then shuffle your library.