San of wisdom

Shadow (This creature can block or be blocked only creatures with shaodow)
You and Ninjas you control have hexproof.
Play with the top card of your library revealed.
Once each turn, you may cast the top card of
your library if it's an instant or sorcery card.
If a source you control would deal damage to a
creature or player, it deals double that damage
to that creature or player instead.