Why not just run something like back to nature to contend with the Jeskai deck, I assume that's what Eidolon is for, and back to nature at least can also be brought in for the constellation decks.
I also thoroughly disagree with goblin rabblemasters in the Temur decks, he does nothing to help your stubborn denials and on turn 3 there's things like Boon satyr that help you out more and allow you to keep up counter spells on their turn.
The coursers don't fit at all and are only there to filter lands as far as I can tell.
I'd also pack 3 angers in the side, when you bring it in you'll want to draw it (red aggro and Jeskai)
Good luck with the deck, I play it right now and love it even if it isn't perfect atm.
For the Temur deck, Ashcloud Phoenix seems very good. Evasion and ferocious in one package for one mana less than stormbreath.
I'm not a fan of Boon Satyr with its double green man cost tbh. A 4/2 man doesn't accomplish much either in this meta. The only boon is the flash and option to bestow. Rabblemaster on the other hand can battle rhinos. I'd even look into playing Stoke the Flames. Rattleclaw Mystic seems significantly better than Caryatid. Rabblemaster and Caryatid look awkward together.
I appreciate the input, both of you.
The Eidolons, Coursers, and Caryatids are a meta call on my part. There are likely going to be a ton of tag-a-long Jeskai Asc/Heroics showing up this weekend and also a ton of things aiming for them. I am trying to shape my deck around both.
The Eidolons are a good hoser against the deck because it relies so heavily on casting 1 mana spells in multiples and I decided to attack that side of it, rather than removing the Ascendency. My plan for the Ascendency is to just counter it and never let it hit the board. I agree with maybe upping the angers, though, because that is also an effective hoser against constellation, given that all but 3-4 creatures in the entire deck are 1 or 2 toughness.
Coursers are there to make sure I have a "threat" out which filtering lands to the battlefield. It's a strange choice for what should be a more-aggro-than-midrange deck, but in playtesting, I was too often dying with a stormbreath in my hand before I put those in.
I was running Rattleclaw Mystics until Wednesday night. I love it's aggressive posture. But I also expect to see a ton of Jeskai burn and tempo this weekend, as it's possible the best meta call right now. It holds up well against the abzan decks, it boards into control for GB Constellation, and it hoses the combo deck with almost no changes. The call was that mystics die to Lightning Strike and Magma Jet and Carytids don't. Otherwise I would be playing the Mystics.
Rabblemaster can steal games and is also good for a post combat Crater's Claw. Three mana threats are pretty important in the face of so many decks that don't even play a spell til turn 2. I agree that he looks awkward beside Caryatid, though.
I played with Ashcloud Phoenix and I really liked it. I found it to be a 2/2 with me at 5 mana and not 6, more often than not, but it's still a fantastic 2 for 1. I originally had 2 in the main and then they moved to the board, and then got outed by the move to a counter burn board. They could almost replace the Rabblemasters, if that card wasn't so efficient at managing the mind game.
Firemind, what would you cut for Stoke? I tried to fit that in, but I didn't want to drop my creature count and the charm, denial, and claw are a really good fit.
