Amumu, The Sad Mummy

When Amumu, The Sad Mummy enters the battlefield, exile all of your creatures
Other players can't cast creature spells
Spells that target only Amumu, The Sad
Mummy cost {2} more to cast
When Amumu, The Sad Mummy leaves the battlefield, return all creatures exiled by
Amumu, The Sad Mummy to the battlefield
under their owner's control