Questions for Unstable Based on past Un-sets, we have a pretty good idea about how Un-set finance works
A less obvious choice would be to play around a commander that gives us a discard outlet
They are awful early and late game you often cannot afford the time to spend all that mana on them
You still sacrifice your Warrior tokens on your end step if the mobilize creature that created them leaves the battlefield before your end step
Theres also a (deliberate?) departure from vastly overpowered spells or commanders for each deck like Teferi's Protection, Toxic Deluge, or Edgar Markov
While you dont need the in-depth knowledge of a judge, you should be both familiar with and up to date on the following aspects of Magic: The Gathering : Rules of how to play The sanctioned formats promoted by WotC (Commander, Standard, Pioneer, etc.) Top decks, strategies, and cards within sanctioned formats This will help you not only understand why certain cards are desirable compared to others, it will also hone your instinct for what might make a good card in the future