Silent-Blade Oni [Planechase 2012]

Set: Planechase 2012 Type: Creature — Demon Ninja Rarity: Rare Cost: {3}{U}{U}{B}{B} 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.