The Commander Brackets are a guideline, not a static "this deck belongs here." You'll find many decks are going to be bracket three
Of the two, the Madrigal deck feels a bit more complete because it is largely made up of Madrigals with a few other cards sprinkled in, while the Frozen deck is a bit of Frozen, a bit of Tangled, a bit of Hercules, with some Mulan, and Raya, and Mickey Mouse thrown in the pot
Gifting cards are noticeably powerful, and for the most part, I think in Limited and 60-card they are at present reasonably balanced and not a cause for concern
Another reason I really like Steel Seraph is that it fills multiple roles, at different points in the game, but succeeds in filling a crucial niche in our Pyre of Heroes chain, another of our additions
Ideally, you want to hit a massive creature that is not only central to your strategy but will also significantly buff whatever presence you have in play
Really, its that simple
