Lol. I just made almost exactly the same deck independently. Ninja'd by four days.
6rl 6rl 744 744 744 744 744 744 744 744 744 744 744 744 744 745 745 745 745 745 746 746 746 746 746 746 74h 74h 74h 74h
I believe it could have a ttw less than 7, but I only played a handful of games versus the old AI3 in trainer so my guess might be off.
Get the gavel and a charger or two out early and use catapulted armagios to finish up. An armagio does 22 damage, the same as three charger attacks. In a pinch you could also use armagios defensively, but against AI3 that won't usually be necessary.
I started by making the following deck:
744 744 744 744 744 744 744 744 744 744 744 744 744 744 746 746 746 746 746 746 748 748 748 748 74c 74c 74h 74h 74h 74h
I'd intended to call it "Four Flings" cuz catapulting four armaggios/dragons does 88 damage and the remaining 12 is easy enough to get. In the process I found a pretty respectable mono-gravity speed deck.Nice deck, GG.