Bane, Strife Emperor

Whenever Bane enters the battlefield, you
become the monarch.
As long as you are the monarch, spells you cast
cost {1} less to cast. If you are not, creatures you
control have menace and trample.
You may return Bane from your graveyard to
your hand by exiling the top of your library until
you have exiled cards with mana value 10 or
more.