A long time ago I constructed a R/U Elemental deck for Extended for Supreme Exemplar and used Unsummon to get the creature back. I actually uploaded a modification for that deck a bit ago that put alot of duplication into the mix. This one uses the same mechanic, the old Incandescent Soulstoke/Flamekin Harbinger. But instead of using Blue it sticks to just Red and uses Nova Chaser instead of Supreme Exemplar because it works with Thunderkin Awakener. I made this on Moxfield as well to use their playtest feature and it seems to work very well.
Any suggestions? I noticed a Nova Chaser deck the other day on Tappedout that included Tainted Strike as a win condition, and since it was now R/B it also could include Duress. I'm not really certain that Black is necessary though. As much damage as I'm doing in testing, I don't think poison will make that much of a difference. There is a small amount of utility in this one as well. And it could be Modern legal with Dormant Volcano and Flamekin Village being taken out but it'll lose it's Turn 3 Nova Chaser + Assault Strobe attack. I don't have a sideboard yet but it would be mostly utility 1 ofs to deal with things like enchantments.
I kinda agree that infect is likely unnecessary considering assault strobe exists. I have to ask though, Why Heat Shimmer? Wouldn't something like Temur Battle Rage be better for the evasion it gives? I think you should cut Dormant Volcano. It's your only card that isn't modern legal, and quite frankly it's slowing down your deck. If you want the mana compaction, Rakdos Carnarium would be better, though I suspect you'd rather have something that comes in untapped.