At present though, I think your best going-first option is Solemn Judgment, given your plan can indeed fall apart if your CotH is popped at the wrong time, or you meet with a devastating Forbidden Droplet
White Plume Adventurer warped the Legacy meta for a time because a good draw could play it turn 1, and many draws played it turn 2before the opponent had a chance to establish a board presence and contest The Undercity

This deck contains the following cards:Extra Deck (x10):VWXYZ-Dragon Catapult Cannon (x2) - CommonXYZ-Dragon Cannon (x2) - CommonVW-Tiger Catapult (x2) - CommonXY-Dragon Cannon (x2) - CommonXZ-Tank Cannon (x2) - CommonMonster (x20):Y-Yare Head (x3) - RareZ-Zillion Tank (x3) - RareUnion Driver (x2) - RareV-Tiger Jet (x2) - CommonW-Wing Catapult (x2) - CommonX-Head Cannon (x2) - CommonY-Dragon Head (x2) - CommonZ-Metal Tank (x2) - CommonHeavy Mech Support Platform (x2) - CommonUnion Pilot (x2) - CommonSpell (x11):Fusion Deployment (x1) - Super RareUnion Hangar (x3) - CommonXYZ Combine (x3) - CommonEnemy Controller (x2) - CommonThe League of Uniform Nomenclature Strikes (x2) - CommonTrap (x9):XYZ Hyper Cannon (x2) - Super RareA-to-Z Energy Load (x3) - RareUnion Scramble (x2) - CommonRoll Out
Day Game Mat will be randomly distributed as a door prize amongst Duelists who participated in the event or who came to spectate
Low Tech Tuesday is where the real fun happens offline
Of course, this is From the Lab, and a regular old Dragon tribal deck isn't quite my style