Im not into coding that much but I think you need a time between the "reset=combat Mind Sear"
like /castsequence [nochanneling] reset=5 Mind Sear, Mind Sear,nil"
I also think there is a dfferent way to do it. I have a macro that i use on most boss fights when im boxing that looks like this....
/castsequence [nochanneling] reset=30 Vampiric Embrace, Vampiric Touch, Shadow Word: Pain, Mind blast,
Devouring Plague,Shadow Word: Death, Mind Blast, Mind Flay, Vampiric Touch,
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