So we have all been in a uproar about the new update 1.10.2 and I have a suggestion that I’d like to entertain. We had built these deck for the contest previously with restrictions set for how many rares/mythics you could build with, and now masterpieces into the mix even more so. Why don’t you have events with restrictions, which would help elimate issues of top players using overpowered builds in Gold tier (one thing D3 is trying to accomplish) it would stop possible abuse of low level PW use, aka smurfing, and make this game closer along the lines of real life MtG tournament play.
Do events that are required to use only kaladesh cycle, and with the rotation of each block required cards, the vault would rotate at the beginning of the week to help players prepare for that weekends cycle event. It would help create a new type of building of decks for events that wouldn’t nessarily be Olivia or Deploy or GAH every event 
maybe the top ten coalitions would have to reload at their play styles even, having gotten used to open builds with all the cards of the colours available.
Again just spitballing some ideas that maybe would help make the events more fair without breaking the game like it appears to have had happened… im trying to stay positive and not direct hate towards what the Devs have done. Let’s instead try and give them positive, however hesitant it may be, ideas and push for a better change for the next update!!!