Great Build, Poor Player.
You could just use a common legend pet and your build would still be great, but you preferred hacking for a pet that doesn’t greatly increases your damage and now you got what you deserved.
About your build, I doubt too much it’s 100% of time guaranteed win against Immortals. While just now Mr. Scooty hasn’t Sanctuary Mythic, Mandelbrot still has it, which means he still can trade with you after your Sureshot happens.
I also know perfectly know how Alchemy Mythic works on these builds: Just let HP be a little greater than MP and see Sureshot never happen against them. While it could solve the problem against these types of build, it would ruin Immortal builds due reasons I won’t explain.
I must also mention that “anti-immortal” builds were already discussed and why you don’t want such type of build.