I'm definitely intrigued by your take on the artifact build we've all been scratching our heads, trying to attempt. Out of curiosity, did you find 20 red cards to be a tad light for Chrome? Or were you running it purely because you didn't have the Opals (although I also suppose one could argue you'd be afraid of the "Legendary," rule which, surprisingly, nearly every affinity player seems to forget :P).
Ankh of Mishra seems like such an absurd card to win with, but it does get there and is very synergetic with the deck. 3sphere/Golem/Rain means they're required to drop lands if they want to have any chance against us but Ankh punishes them for doing so, then our moon effects negate the usefulness of their land.
Etched Champion seems particularly plausibe in the artifact build and tbh I hadn't quite considered him.
Out of curiosity, how big was the tournament? And what were your MU's?
Forlorn Egoist