So if you're not doing 4zap/2eq Penta, best use for the donated spell has to be double poison, right? Pop cc, no need to lure and just drop two poisons. Will kill any non golem/hound CC. And bonus points if you can get AQ in there.
Double poison for hog raids, no? One for the cc and one for ground skeletons.
For TH9 you can take 3+1eq and then add a rage for a Shammy style raid. I still think for deep queens a pent, even with two air d down will be too much to deal with. Could be way off here.
For TH9 meta will surely be 4zap+2eq until bases adjust a little.
For TH8 hogs take two poison
For TH8 drags take haste+poison
TH10 looking at lots of options. Most likely will see 3+1 eq but occasionally haste as the +1 on a pure pent. Also could see a zapquake style TH9 raid as well even all the way up to max air d. Impact at TH10 not nearly as strong as TH9 though, it's going to be epic at 9.