When a creature encoded with Stolen Identity phases out, the connection between these objects is lost because rule 702.99c uses for as long as. If your devotion to blue is five and Thassa, God of the Sea phases out, then the game no longer sees it, your devotion to blue drops to four and Thassa ceases to be a creature
For the purposes of format legality, deck construction, game rules, and effects, these cards have only the card name specified in the secondary title bar, says WotC's official Final Fantasy Release Notes
II Return all non-Phyrexian creatures to their owners' hands
Thats plenty of sorceries, instants and enchantments covered
Or are you just some soulless Magic beast who finds fun in trashing others? Unfortunately, for many competitive players, an obviously-one-sided game IS fun to them, while its not very much fun for the other player
Its here where the real fun begins