So, even though it's not destroying anything, you can actually prevent not only the Ba Sing Se that is already on the battlefield from making any relentless 2/2 attackers, but all future copies of Ba Sing Se
However, this build offers the potential to turn Zur into a creature-focused deck, similar to the way Yisan, the Wanderer BardYisan, the Wanderer Bard is built, though with some obvious and significant differences
While he's not broken by any means, I do like him as a solid card to put in when Jace, the Mind Sculptor is a little pricey
This is especially important when investing in rare or expensive singles
First, let's cover the staples: there really aren't that many cards that can proliferate in Blue but we do happen to have two of the most powerful proliferate engines in the game: Flux Channeler and Inexorable Tide