@evouga I like this approach far more than the "restrict and ban more stuff" approach. Then just let things shake out from there. I suspect Trinisphere and Balance would be back on the list pretty fast, though.
I have never been a fan of this screwy "Scry 1" mulligan rule. At least this one seems more elegant than mulligan any number of times and still just Scry 1 - I would like to test it out before throwing it under the bus.