The deck I used to reach masters after starting to play the day after homecoming was released. Started with Almost's deck
Ixtun Pledge but had to modify it along the way to fit my playstyle. Started at gold 2 three days ago
The flex pick imo is
Display of Honor and the numbers on Gunrunner and Courier, the rest is pretty set in stone.
Palace over Peak in main deck because with so many mirrors you often need more than one palace to finish the game.
Consider running
Casualties of the Cause if you are facing too many mirrors in place of Display. It can also double up as removal for other cards.