In terms of actual potency disregarding the basic land types the shock lands are probably just behind pain lands in power, in cube at least where you don't get those draws of all pain lands and end up killing yourself which can happen in constructed when running 4 copies of each pain land
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So here we have data for A/B/U, the first 3 sets released in 1993
"I was completely shocked
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I hope that those things help you stay in love with drawing so that you can go through the whole process enjoying yourself and enjoying drawing the Pokmon you love