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.)
Better yet, tons of sagas produce the other permanent types you need for a fully-charged Baba Lysaga activation, like how Welcome to Sweettooth provides food tokens and The First Iroan Games creates a gold token
Blue is often paired with other colors that can deal with creatures outside of the stack
For example, Pack 1 and Pick 1 in Vintage Cube are strong, though
There is a 2.6% chance these will be included as your fourth card, and a 10.3% chance they will be included as your fifth card