I'm not sure about Arcane Ring in this build because I'm trying to build up my mana generation as fast as possible. I don't improve my channeling as quickly if I take an action to cast the ring, and I want to set myself up to be flexible in later turns.
The Harmonize is on the Battleforge, and I cast the Moonglow Amulet from the Battleforge, so I start round 3 with 13 channeling, 2 mana on my Battleforge, and 17 mana, if I did my math right.
Against a Lord of Fire and Warlock beatdown strategy I would then start using my shield every turn, play Dragonscale Hauberk and Elemental Cloak from my forge, and use Teleport, Cheetah Speed, Mongoose Agility, and Force Hold (should be replaced with Enfeeble, see below) to prevent you from getting many attacks in. I'd take some damage early, but you'll need to remove my Dragonscale Hauberk and Elemental Cloak if you hope to get much damage through with Lash of Hellfire and Lord of Fire, which buys me time to get things in place to kite you. I don't know how consistently it would work out in my favor, but I think I actually have some pretty good options against that type of opening. That opening is somewhat similar to one of my Warlock openings, so I can definitely see where you're coming from.
Against your Priestess opening I'm somewhat less sure. I could build up armor, which would drastically reduce the damage your Royal Archers will do, but won't have much impact on Brogan. I would need to focus on attacking your Priestess while playing keep away with Brogan. This build has tools to do that, but I'm less sure how to deal with a stream of big creatures than I am how to deal with a bunch of small creatures. In retrospect, Enfeeble is much better for this build than Force Hold. They both prevent melee creatures from closing with me effectively, but Force Hold has an upkeep. If you don't have ranged support, I can probably kite you pretty effectively, but with ranged attackers backing up powerful melee attackers chasing me around, I'm less sure. Another possibility is to use Wall of Fire to control spacing. If I block line of sight to your Archers, things become more manageable.
I tend to focus on low creature count builds. The Wizard can set up a powerful slow army, but this build is supposed to focus blasting things rather than using the slow arcane creatures. I tried to get a blasting Wizard to work without the buildup time, but I didn't have enough mana to do everything I needed to do. Activating Voltaric Shield most turns eats up a lot of mana over the course of a game.