AD -
What about, for Fairy Godmother, if you simulate the creatures being "bad" (those are the ones she chastises, right?) getting the treatment? Something like "Opponent's successfully attacking creatures turn into a pillar matching opponent's Mark for one turn."
You can even have upped/un-upped be similar to Pandemonium where un-upped is cheaper/tougher/etc but affects ALL creatures and upgraded is more expensive/weaker/etc and affects only opponents' field...?