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
For example, if an opponent controls three permanents that each have two stun counters on them, you could remove one stun counter from each of those permanents
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Diablo also has a unique shift requirement, having you discard an action card to be able to shift him onto another Diablo character
While it remains to be seen how impactful this card will be, Im already seeing people talk about it as a potential cEDH inclusion
If you're looking to get a head start, my Tier List on 17Lands can help you assess card strength and make informed build decisions