Thanks for the many useful answers!
If I had only known those a single turn earlier! I guess that either knowing about the corner-self bless and/or the blood slave batteries would have saved my day. I did already account for a battle in the normal turn phase, which is why the Rudra had 5 or 6 death gems - which I thought would be enough to cast SoulVortex twice, but according to the above link Wiki page, he would never use those anyway with that script. Good to know that the Dom3 is not so wasteful on gems.
