So I was looking for something to replace my mono Blue Valkyries deck in tournaments after the Bridgeway Troll nerf and I saw Koshi playing a blurple coliseum deck on his stream.
His original deck can be found here: https://www.mythgardhub.com/deck?id=2647
I made some tweaks and currently 33-10 in Champion.
Same game plan as mono Blue Valkyries: play on curve, get favorable trades, and then SMOrc.