Both Suppression Field and Reprisal saw a decent amount of sideboard play between both SCG Opens the first week of new Standard, actually. I suspect they’ll be around.

Also Jeskai Charm, Suppression Field, and Reprisal (not sure if the latter two have actually shown up much in decks yet). Sarkhan is good no doubt, but he’s susceptible to more removal and it feels like half the time he dies on the crackback attack or to a lesser burn spell (if you used his 2nd ability).

Abzan Charm, Utter End and Banishing Light are white, though. Stormbreath Dragon can also block (almost) all of the Abzan deck’s creatures with little concern and also run past Wingmate Rocs on defense.
I haven’t playtested the format enough to be certain, but I do think Stormbreath Dragon has a lot of good points.
Stoke the Flames, though…

None of those decks are using white removal though. If that were the case, I’d agree with you, but they will just burn your dragon out with Stoke the Flames. It’s not that stormbreath’s bad mind you, I just think Sarkhan is better.

Stormbreath seems much better positioned against a metagame that’s bound to be full of Jeskai and Abzan decks now that we’ve seen the results of the PT.

At the prerelease I had a buylist for the promos slightly higher than the normal buy price. This drastically worked out in my favor. Dig Through Time at $1 for example.

Noone gives promos a second thought, so I’ve managed to pick up a few Dig through Time and Jeskai Ascendancy promos on the cheap (sub $10), not to mention the Legends (sub $5).