No. Ninjutsu puts a creature onto the battlefield "tapped and attacking". "When ~ attacks" triggers only trigger when you declare them as attacking at the start of the Declare Attackers step. Any time a creature is put onto the battlefield "tapped and attacking" it will not trigger any "attacks" triggers. It will still get its "enters the battlefield" trigger however.
508.3a An ability that reads “Whenever [a creature] attacks, . . .” triggers if that creature is declared as an attacker. Similarly, “Whenever [a creature] attacks [a player or planeswalker], . . .” triggers if that creature is declared as an attacker attacking that player or planeswalker. Such abilities won’t trigger if a creature is put onto the battlefield attacking.
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Tyrant-Thanatos says... Accepted answer #1
No. Ninjutsu puts a creature onto the battlefield "tapped and attacking". "When ~ attacks" triggers only trigger when you declare them as attacking at the start of the Declare Attackers step. Any time a creature is put onto the battlefield "tapped and attacking" it will not trigger any "attacks" triggers. It will still get its "enters the battlefield" trigger however.
January 9, 2023 2:24 a.m.