Simply put, a precon is a pre-constructed, 100-card Commander deck sold by Wizards of the Coast (WotC), ready for action straight out of the box
Update 17/07/2024: With the run up to Bloomburrow being filled with spoilers, Wizards of the Coast have given us an insight into what to expect with the Starter Kit decklists, the new mechanics and how to collect Bloomburrow
Which ones rank the best, and how can mill be a good tool in EDH
Inspiring Leader and Far Traveler are great if you want to keep it mono-white, its hard to go wrong with Candlekeep Sage for card draw, and Agent of the Iron Throne adds potential aristocrat synergies
Being a Special Guest printing, the supply of this wont be particularly high, so it wont drop the price of base versions much
There was only one Magic card that was rejected outright that I had to do over