Nahiri, l'Araldo

If the artifact or creature put onto the battlefield with Nahiri’s third ability leaves the battlefield before the next end step, it won’t be returned to your hand from its new zone.

If you find a noncreature artifact with Nahiri’s third ability, it will still gain haste, even though it won’t be meaningful unless that artifact becomes a creature.

You can activate Nahiri’s first ability with no intention of discarding a card just to add loyalty to Nahiri.