Twilight Drake instead of Twilight Guardian because of Brann Bronzebeard and Burgle, Swashburglar, Undercity Huckster, Nefarian, Azure Drake and Netherspite Historian will keep your hand full for higher health. Also Twilight Drake is better against priest because of it's 4 attack.
Brann Bronzebeard gives everything in this insane value.
This deck my end up being pretty good against Priest in Mean Streets of Gadgetzan. I will update it once I have played a few games and made appropriate changes.