Standard Event is a scam! Do not play!
If you're looking to have fun, do not play Standard Event! WotC has a secret matchmaking system for the match to ensure you waste coins and gems by matching your deck against any deck that can theoretically counter it. Playing Aggro? Get ready to face only control matchups. Running a control deck? Get ready to face either aggro or even harder control. As I wish this was case of just "git gud" but all decks I've ran have pretty much worked on my ranked climb (Plat 3 currently). Yet, somehow, I only find opponents that counter my deck.
I'm not sure why they team would keep this secret. Ensuring players know what to expect can ensure that players can build their accordingly to have fun. And I've seen multiple content creators notice the same thing regarding this "shadow" matchmaking.
Why hide this WotC? Are you that desperate to continue to be Hasbro's cash cow that you deliberately mislead players on how the events work in order for them to burn through coins and gems?