Sasuke Silent Blade

Ninjutsu {4}{u}{b} ({4}{u}{b}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever Silent-Blade Oni deals combat damage
to a player, look at that player's hand. You may
cast a spell from among those cards without
paying its mana cost.
"Stealth makes way for the use of your enemies
weapons against themselves"-Silent Blade