Bloodrite Shinobi

Ninjutsu {1}{b}{b} (Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever Bloodrite Shinobi or another Ninja attacks and isn't blocked, you may discard a card. If you do, search your library for a Ninja card, reveal it and put it into your hand. You lose life equal to its converted mana cost.