月刃の忍び

Text:

忍術（, あなたがコントロールしていてブロックされていない攻撃クリーチャー１体を手札に戻す：あなたの手札からこのカードをタップ状態で攻撃している状態で戦場に出す。）
月刃の忍びがプレイヤー１人に戦闘ダメージを与えるたび、飛行を持つ青の１/１のイリュージョン・クリーチャー・トークンを１体生成する。

Rulings:

• 6/14/2019 The ninjutsu ability can be activated only after blockers have been declared. Before then, attacking creatures are neither blocked nor unblocked.
• 6/14/2019 As you activate a ninjutsu ability, you reveal the Ninja card in your hand and return the attacking creature. The Ninja isn’t put onto the battlefield until the ability resolves. If it leaves your hand before then, it won’t enter the battlefield at all.
• 6/14/2019 The creature with ninjutsu enters the battlefield attacking the same player or planeswalker that the returned creature was attacking. This is a rule specific to ninjutsu; in other cases, when a creature is put onto the battlefield attacking, that creature’s controller chooses which player or planeswalker it’s attacking.
• 6/14/2019 Although the Ninja is attacking, it was never declared as an attacking creature (for purposes of abilities that trigger whenever a creature attacks, for example).
• 6/14/2019 The ninjutsu ability can be activated during the declare blockers step, combat damage step, or end of combat step. If you wait until after the declare blockers step, because all combat damage is dealt at once, the Ninja won’t normally deal combat damage.
• 6/14/2019 If a creature in combat has first strike or double strike, you can activate the ninjutsu ability during the first-strike combat damage step. The Ninja will deal combat damage during the regular combat damage step, even if it has first strike.