There's also some lore here about the vampires of Innistrad, which is neat, by the focus is on a bunch of moving parts that churns out Blood and uses it to bring a bunch of creatures back into play
With that in mind, here is how I would argue for their unbannings, if I were so inclined
The game treats it as a spell until it resolves, gets countered, or otherwise leaves the stack
On one hand, Vesuvan Shapeshifter can keep copying the same value morph creature for a turn-by-turn advantage
Fable has been turning up all over Standard, of course, but it has also made it back as far as Red-based Prison and Stompy decks in Legacy (and some people have even been trying it out in Vintage)
Thats a lot of beloved characters to enjoy, and a lot of new options for heading up your Commander deck