Silent-Blade Oni

Silent-Blade Oni

Creature - Demon Ninja | Power/Toughness: 6 / 5 (CMC 7)
Ninjutsu (, 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.