Oni der lautlosen Klinge

Ninjutsu {4}{U}{B} ({4}{U}{B}, bringe einen ungeblockten Angreifer, den du kontrollierst, auf die Hand zurück: Bringe diese Karte aus deiner Hand getappt und angreifend ins Spiel.)
Immer wenn der Oni der lautlosen Klinge einem Spieler Kampfschaden zufügt, schaue dir die Karten auf der Hand des Spielers an. Du kannst davon einen Zauberspruch wirken, ohne seine Manakosten zu bezahlen.

Oni hoja silenciosa

Ninjutsu {4}{U}{B}. ({4}{U}{B}, regresar un atacante no bloqueado que controlas a la mano de su propietario: Pon esta carta en el campo de batalla de tu mano girada y atacando.)
Siempre que el Oni hoja silenciosa haga daño de combate a un jugador, mira la mano de ese jugador. Puedes lanzar un hechizo de entre esas cartas sin pagar su coste de maná.

Oni à la lame silencieuse

Ninjutsu {4}{U}{B} ({4}{U}{B}, renvoyez en main un attaquant non-bloqué que vous contrôlez : Mettez sur le champ de bataille cette carte, engagée et attaquante, depuis votre main.)
À chaque fois que l'Oni à la lame silencieuse inflige des blessures de combat à un joueur, regardez la main de ce joueur. Vous pouvez lancer un sort parmi ces cartes sans payer son coût de mana.

静刃の鬼

忍術 {4}{U}{B} （{4}{U}{B}, あなたがコントロールしていてブロックされなかった攻撃クリーチャー１体を手札に戻す：あなたの手札にあるこのカードをタップ状態かつ攻撃している状態で戦場に出す。）
静刃の鬼がプレイヤー１人に戦闘ダメージを与えるたび、あなたはそのプレイヤーの手札を見る。あなたはそれらのカードの中から呪文１つを、マナ・コストを支払うことなく唱えてもよい。

静刃邪鬼

忍术{4}{U}{B}（{4}{U}{B}，将一个由你操控且未受阻挡的攻击生物回手：将此牌从你手上横置放进战场，且正进行攻击。）
每当静刃邪鬼对任一牌手造成战斗伤害时，检视该牌手的手牌。你可以从这些牌之中施放一个咒语，且不需支付其法术力费用。

Silent-Blade Oni

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.

Outlaws of Thunder Junction Commander

New Capenna Commander

Commander 2018

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 nonland card in it without paying that card's mana cost.

Planechase Anthology

Planechase 2012

If you cast a card without paying its mana cost, you can't choose to cast it for any alternative costs, such as evoke or the alternative cost provided by the morph ability. If it has {X} in its mana cost, X must be 0. However, you can pay optional additional costs, such as kicker, and you must still pay mandatory additional costs, such as the one on Fling.

If you cast a permanent spell this way, it will enter under your control when it resolves. If you cast an instant or sorcery spell this way, that card will be put into its owner's graveyard when it resolves.

The nonland card you cast via the triggered ability is cast as part of the resolution of that ability. Timing restrictions based on the card's type are ignored. Other restrictions, such as "Cast [this card] only during an opponent's turn," are not.