Dies to Removal

Playing Jeskai online for a few days now and it seems strong. I've tried with and without Rabble and not sure yet. Hushwing Gryff could be an interesting alternative, I think.

I like Sarkhan as a mirror tech for the SB.

Most intrigued by the fact that all the core cards are KTK or later, so the deck should be viable for some time (assume we get any halfway decent dual lands in Battle for Zendikar)

If you mean the GB Constellation Deck, Hushwing Gryff is good. With the Little Jeskai deck and all your red sources, why not try Searing Blood and go the burn route?

Can you post a link to a typical GB List?

Interesting, now little Swiftspear makes their way into Jeskai. Curious to see how Defiant Strike is in testing. I tried it out in Mardu, and for me seemed to work less good in practice than on paper. Maybe I was just playing it wrong?