Perhaps they could take a more obvious approach with their rarities like Magic: the Gathering, with its Prosperity cards in Outlaws of Thunder Junction, or even add another layer of Disney magic to cards like with Star Wars Unlimited's Hyperspace rares
Combat-focused builds stack +1/+1 counters or grant mass trample to close out games
Pair him with token doublers like Doubling Season or Parallel Lives and your board spirals out of control fast
Insert Reliquary Tower to keep from discarding all those cards
Mila, Crafty Companion and Valki, God of Lies can be cast on their creature side or their planeswalker side from the command zone, though theyre treated as your commander regardless of which side you choose
One tricky rules interaction involves copying bestow cards that are enchanting another creature, perhaps with an effect like the one on Three Dog, Galaxy News DJ