But if you play KC-MC, do something else, play another KC-MC, do something else and play a third KC-MC, you can't rearrange the cards to leave one KC out, you have to leave them all out.
The rule is still weird to me though, because the gist of it was: If it's not modifying another card anymore, the KC leaves. But the KC is still modifying the second KC after your turn is over.