Related In Pocket, a Gym Challenge that bans EX cards would be a great way to freshen up the game, as it presents two drastically different ways of playing
This is an Angel (so will have some interest), but will also be another $1.50-$2 card in the end
This gives your opponent a hint at what might be about to come their way, and even when you put a creature into play, they usually cant be used to do damage until the next turn, unless the card is an instant, a category of card thats yet another exception to the rules
Wizards recently shifted towards making Clue tokens without actually using the word investigate
However, fun as that sounds, I'm concerned it may wear thin when almost every box on that checklist remains starkly unchecked