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Obviously, not all of the will be Mana Crypt, but this certainly is a good list for a "Great hits: Artifacts edition"

Blue Draining Whelk In Commander, counterspells have to do something additional in order to be useful

Of course, if you counter a spell with this before you have three colorless and two blue mana available, you straight-up lose the game during your next upkeep so the drawback is quite steep but any counterspell player knows exactly the right time to pull this tremendously strong free counterspell out of the bag so they wont get hit with a good game prematurely

We also get a very tiny insight into WotC's QA involvement with this article