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There are no rules on this kind of mechanic, but it seems like an interesting application of morph that we could very easily see in a future set

If you're playing casually, there are no restrictions then

10 Shroofus Sproutsire Anime - $15.36 The anime cards from Foundations Jumpstart take up most of the high-value cards from the set, starting with the Saproling legendary Shroofus Sproutsire

So, Hades's mana value is 3 because Emet-Selch's mana cost is Adventures Adventures return in this set

While Fuwalos used to be a $60 card, recent reprints in Quarter Century Stampede have brought the price down to a more manageable $13 for Near Mint copies