@brianpk80 Coming from more of a Vintage "Viewer" (with a grain of salt), I would ask two questions:
- Do cards that must be built around (like Paradoxical Outcome) have to achieve a higher power level to become unbalanced?
I don't think this actually changes the conclusion of restricting PO. I do believe there is a hesitancy to restricting a card when it would no longer be worth building around a single copy. When a card is in this category, you have essentially banned it without banning it. This situation creates the feeling that you are taking a more extreme action than was intended and creates the feeling that you are "killing an archetype" rather than weakening it. The same could possibly be used to explain the immunity of Workshop and Bazaar.
- Why not just ban Serum Powder?
I made this same comment on Frank Karsten's recent article on the London Mulligan. In my opinion, cards that interact with the way players mulligan should go the way of cards that interact with ante. It is antiquated and only support decks that are looking to abuse the ability to mulligan rather than help reduce non-games.