42 count Main, remove the Ryzeal line and it goes to a flat 40. I added the Ryzeal line to deal with stubborn things that Imperm/Veiler/Ogre don't. Almost always, the push is to use Advance, Statue, Wyvern, Tanker or Catapult to either blow Geartown or bypass and summon Dark Golem directly. Off Dark Golem, search Commander and Duel, toss Commander, banish from GY to play Duel. It's your main driver - AG Fusion is your panic button. Alt lines are blowing Fortress (last resort) or searching Catapult off Advance and blowing Advance for the summon.
Ultimate Ancient Gear Golem is your main line's boss monster, Howitzer and Dragon from the Main are for grind games, Megaton is if you get terrible draws. Chaos is for stall or heavy backrow. Ballista for if you can't hit Tanker or Catapult for some reason. Ryzeal line, Eclipse Twins, and I:P/S:P for slippery removal targets you can't just deactivate with Imperm/Veiler. Qliphort for Link spam, usually Cyberse, and the Clockwork line is mostly for feeling out other uncommon deck types.
First round should always be pushing OTK ASAP, and rounds 2/3 should side the most obnoxious, stalling, board wiping cancer you can get your mitts on out of the side deck. Lancea is for Maliss, swap with more Evenly Matched, Raigeki, or whatever else if you want.