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I do see the appeal to use BW as a way to get a probe to draw into the pile as it also adds one extra storm count. If drawn into IU it requires BBB+1R+UU to get things going, i find it quite mana...

I read over you already played that Therapy and tapped a land.
This would be the safest bet. I can't think of any pile that wins from there.

Also there would always be one window open to cast...

Man, gotta love this riddles.

What i would have done was this:

Tap U.Sea and Cast Cabal Therapy, wait for response of opponent. Then either he respons with Price of Progress or not.
When he...