Oh! That's a lovely way to do the "Kill complex stuff". And black gets plenty of "kill creature (with a limitation)" - I can imagine the frustration of your poking them to bits with vanilla creatures.

Yow. It does include even just abilities like flying. I wonder if this could say "with an activated or triggered ability"?

Oh... although even that does also include ETB-triggered abilities (that have no other remaining relevance), and indeed abilities like Cycling or Unearth that have no other relevance while on the battlefield. That's somewhat unpleasant.

For the same block as Muraganda Petroglyphs, I guess.