If a mutating creature spell merges with a creature that's only temporarily a creature, it will remain a merged permanent when the effect making it a creature expires
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Of course, printing a narrow sideboard card like Grafdigger's Cage doesn't mean that Snapcaster Mage goes from the best card in Standard to completely unplayable, but it does offer players a way to compete with the graveyard theme from Innistrad
Few cards indeed manage such a feat as to be worth cheating out but also castable in the normal manner
I'm not excluding cards that transform into lands, and Ojer Axonil, Deepest Might is an impressively powerful card, but we're focusing on lands, and that's more of an afterthought here