Disclaimer: We don't have any rules entries or the like for Battles yet, so I'm only going to be covering what I'm sure about so far
Emeritus of Truce The White Emeritus is the only one that can't re-prepare itself and, when revealed, was subjected to hearty guffaws about how WotC always gives white the worst toys
Turns out the original role-playing game is a lot more flexible than I thought, with plenty of tropes and traditions that can be turned in to fun new Magic mechanics
Corpse KnightCorpse Knight hits them whenever a creature enters our battlefield, while Knights ChargeKnights Charge brings the hurt whenever we attack
The deck starts by casting a number of efficiently-costed faerie creatures with strong secondary abilities including Sleep-Cursed Faerie (flying, ward 2), Obyra (flying, drain), Likeness Looter (loot, clone), Talion's Messenger (loot, +1/+1 counters), Talion (drain/card draw), and more