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Even though Backward Shadow has sentimental value to you, I would switch it with Purifying the Unclean. That way you can convert your other EC to gray and have majority of your GE's being teal plus your heal card. If you lose Paul and have to convert someone else you want it to be teal probably and you'll want a teal healing card.
Even if you just have Zimri, you can still block and use GiC and keep his ability for later.
What happens if Caves gets destroyed? Any capture will just defeat you.
Just throw ZT or TGT in there and they'll immediately be distracted by that, and kill it instead of Caves.
I'm not sure if IaR is enough because it doesn't protect from capture, leaving you open to capture/rescue and capture/shuffle, either of which will end your offense. Covenant with Palestine may work better.