@khahan My own bias as a hatebear pilot would LOVE this. My logical self hates this though. I don't think you should really EVER restrict Mishra's Workshop any more than you should restrict Force of Will or Dual Lands, or Bazaar of Baghdad or Cavern of Souls. Mishra's Workshop is a fundamental "glue" card of the format and allows for an entire archetype to exist and thrive. I'm sorry, but the competition is capable of much more broken things in Vintage than in Legacy and you're basically proposing to make the "Workshop" MUD archetype relegated to the power level of Legacy MUD, but with the same Vintage competitors that we currently have. That just won't work. Try it sometime. Try 100 games with your restricted Workshop MUD garbage and tell me how often you beat: Mentor, PO, Oath, Eldrazi, Dredge, etc etc etc. It isn't a deck in Vintage without Mishra's Workshop no matter how you slice it. City of Traitors in Vintage is a garbage land that just makes your deck incredibly weak to Wasteland: "Oops you were forced to sac your one-shot land to get more mana? I'll just waste your new land and leave you with nothing!" Please don't try to run the narrative that MUD would even remotely be a thing without 4 Workshops to hold it together.