Sato Shokan, Emperor's Fang

Eminence—Whenever a player becomes the
monarch, create a 1/1 blue and black Ninja
creature token with skulk and deathtouch.
Double strike, menace, ward—{3} or pay 5 life
Whenever a Ninja you control deals combat
damage to a player, that player reveals a card at
random from their hand. You may play that card
and you may spend mana as though it were mana
of any color to do so.