Tetsuo, the Winds of Death

Ninjutsu {x}{b}{b} ({x}{b}{b}, Return an unblocked attacker you control to hand: Put this card into play from your hand tapped and attacking. )
When Tetsuo enters the battlefield, deal X damage to Target creature, where X is the casting cost.
When Tetsuo deals combat damage to a Player you may pay {x}{b}{b} to deal {x} damage to Target creature.