All these cards in a single set is just asking for some sort of UW flyers aggro deck, probably with Dovin, Grand Arbiter and Favorable Winds and about 20 1-drops
There are some what if Dreamborn characters who are more powerful or who have gone down a different path presented than their original story
Grist, the Hunger Tide Perhaps my favorite planeswalker of all time, Grist, the Hunger Tide fulfills two vital roles for the sacrifice deck: a sacrifice outlet, which happens to be incredibly powerful since it kills virtually anything you care about, and sacrifice fodder
Blood of Wolves sort of combines them both
Disney Lorcana already has Starter Decks, but for this format, they would follow new rules and have their own "Commanders." In the case of Disney Lorcana , there could be multiple ways to approach a similar ruling to Commander, such as using up to two characters as "Commanders," thus determining either the Ink colors of the deck or the type of characters allowed in it (i.e., Hero, Villain, Dreamborn, Floodborn, etc.)
However, as the demand for more intricate artwork and detailed card information grew, so too did the need for larger card sizes