I ran a modified version of this list this weekend. I only have 5 heartrenders, so I added 5 doomfires with the withering and took the extra command point to be at 1970pts.
The one major downfall is not having the second artefact on the medusa, which could have helped significantly with casting of mindrazor, I missed by one a few times when rolling for it.
As for who got which buffs, that depended on where my opponent places some drops. Sometimes it was the snakes with Catachism, other times, it was the WE.
Overall, I went 2-3. I would like to point out that is was the first time I played this list at all, and the first real time I have used SoS since the battletome dropped.
I am confident that I could have gone 3-2 if I would have deployed better, and possibly 4-1 if better deployed and slightly more lucky with buff rolls. I was about 50/50 for prayers throughout the weekend, so it was a little difficult.
The top DOK lists this weekend all had Morathi. I think her Sorceress Supreme ability shines here. The double of spell distances means you can hang her back and drop spells all over the board, this is especially useful if you are playing in a specific realm like Chamon with and Rule of Burning Iron, only really useful against hordes. The ability to attempt 3 spells and unbind 2 is huge if you don't have other magic support. Once you get past the early rounds, then you can transform her and push her up to add some combat support if needed.
These are just my thoughts and I am hardly a top tier player.