currently there is a very large difference between unrestricted mishra's workshops and even as a one of or zero of. The whole landscape of vintage would change if mishra's Workshop was restricted or banned. In Legacy I know I'm biased but I don't think that a ravager shops deck is as well positioned as a prison version of a colorless deck or eldrazi version of an aggro colorless deck. A big prison colorless has pieces that negate common hate and slow down Decks that may be faster than them or keep them from implementing their strategies. eldrazi goes so big so fast and also has creatures that give disruption without getting hit by no rod command recall and other common hate pieces