All Marvel sets going forward are going to receive this treatment
The other notable one is Hostile Hostel, which can transform into Creeping Inn, a 3/7 horror construct that exiles a creature card from a graveyard when it attacks, before each opponent loses X life and you gain X life, with X being the number of creatures it has exiled
One of those decks is the Planeswalker Party
While it reads like a card for tribal decks, and you can play it in tribal decks, I think it will actually be at its best in token strategies, which tend to almost accidentally have a lot of creatures of the same type
Having to cast it from your hand continues to be both a balancing and limiting factor
Most are in White, but a few aren't: Flipping Out In order to get the maximum value out of our tribe, we need to consistently transform our werewolves and then keep them transformed