These are typically great uncommons that really drive you towards playing a particular color, like build-arounds and good removal, as well as very powerful commons
They will not overwrite effects that modify power or toughness without setting it (whether from a static ability, counters, or a resolved spell or ability), nor will they overwrite effects that set power and toughness which come into existence after they resolve
Even though Prowl will Convert again whenever the 2nd counter is placed, this isnt such a bad thing
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Since some sort of mass-banning is about as likely as physically unprinting the problem cards, we will need to introduce cards which are equally as powerful, but on a different strategic axis