There's not really a dragon theme in the cube for Scaled Nurturer to support, but Bristly Bill is a very high impact 2 drop for Abzan.
Sandsteppe Outcast was originally in here since he was such a role player in original FRF draft, but isn't exactly a very exiciting pick in cube. Harper Recruiter has much better stats and can also help you find other warriors for the warrior deck.
Hinata is considerably less important to a Prowess deck than Narset, which gives all creatures Prowess (or double Prowess if they already have it). I wish all the clans were as spoiled for choice as Jeskai is!
Warriors are a bit heavy in the 3-drop slot. Tinkering around with some replacement level cards to help the curve.
I'm not really sure where Sarkhan has a home at the moment, but it's nice to get another explicit Temur payoff in Red.
Rolling Temblor for most use cases is outclassed by Radiant Flames, which gives decks that can pay the three colors an advantage. And really, are you paying the flashback cost for Rolling Temblor basically ever?
Cloudform and Lightform are decent ways to trigger prowess while still getting a creature, but Rageform is lightly more marginal. Khans mode of Outpost siege can help a red deck stay in a longer game, and Dragons mode can help an aggro deck close out a game where the opponent is on the back foot, so I think this has a higher upside.