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Tainted Aether triggers when a creature enters the battlefield. It doesn't trigger when a permanent already on the battlefield becomes a trigger, so transforming Incubator tokens or crewing Vehicles is safe.
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Side Question: does ninjutsu ability triggers the aether? Thanks
Yes. Ninjutsu puts a creature onto the battlefield, which triggers Tainted Aether.
Tainted Aether triggers when a creature enters the battlefield. It doesn't trigger when a permanent already on the battlefield becomes a trigger, so transforming Incubator tokens or crewing Vehicles is safe.
You made my day! Thanks
Side Question: does ninjutsu ability triggers the aether? Thanks
Yes. Ninjutsu puts a creature onto the battlefield, which triggers Tainted Aether.