My wins vs. Octane have universally gone like this:
Me: SoG, Quinted Oty.
Octane: Flying EE, EE, Unstable Gas, Explode your SoG.
Me: SoG.
Octane: Unstable Gas, Detonate an Unstable Gas, Explode your SoG.
Me: Shield. SoG. Steal an Unstable Gas.
Octane: Detonate your Shield. Detonate your Unstable Gas. Unstable Gas. Unstable Gas.
Me: SoG. Pulverizer.
Octane: Detonate Both Unstable Gasses, Fly an EE, EE, Unstable Gas.
Me: Ahh, now that your own Unstable Gasses have brought your first flying EE into Devouring range, the game truly begins. Bone Wall. Devour your 7/4 EE. Pulverize your Unstable Gas.
Octane: More EE Spam, some Unstable Gasses.
Me: Keep eating the EEs, pulverize your Gasses, use the remaining SoGs w/Bone Wall to keep HP out of Gassing range. Eventually get down a Quinted Fire Queen, and start spamming Fireflies.
Octane: Detonate your Pulverizer.
Me: Keep spamming Fireflies.
Octane: Dies moments before his final Unstable Gas would have killed me.
Me: YAY!
Yeah, that's pretty much The Way.