Any creature that cares about the number of creatures you control needs to have a way to make more on its own, and Adeline does that in spades by creating a 1/1 for each opponent you have
Clouds is themed around equipment cards (think the Buster Sword or the Ultima Weapon), which are essentially weapons you can attach to your creatures to pump up their damage and hit hard
Mickey Mouse, Leader of the Band in Both Mirabels can quest and give support to weak characters like Agustin, Felix, and Ursula, who can challenge more dangerous targets, and then Julieta can heal the damage they take
We doubt it very much
Vorinclex, Monstrous Raider is very easy to cast, and six mana for such a powerful effect is more than worth it
By now you'll find Jafar, Newly Crowned elsewhere on the interwebs, but he's going to be one of the best Disney Lorcana cards in an illusion deck, so it's worth showing him off too