Turning Face Up a non-permanent Manifest can result in a non-permanent on the battlefield

[Susucre]

Setup to replicate:

• Manifest a spell (here Brainstorm)
• Use [[Ixidor, Reality Sculptor]] on it

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Ixidor, Reality Sculptor - (Gatherer) (Scryfall) (EDHREC)

{3}{U}{U} Legendary Creature — Human Wizard 3/4 Face-down creatures get +1/+1. {2}{U}: Turn target face-down creature face up.