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While it remains to be seen how impactful this card will be, Im already seeing people talk about it as a potential cEDH inclusion

Clearly Dalmatian puppy decks are going to focus on going wide with plenty of characters to take advantage of their abilities, and Perdita is going to help a lot in that regard, giving you the chance to play a lot of them quickly

If you are all Rampant Growth and Wall of Roots then Jitte isn't great at all but if it all Lotus Cobra and Llanowar Elf then Jitte is pretty solid

Diablo also has a unique shift requirement, having you discard an action card to be able to shift him onto another Diablo character