The counters even synergise with Bramblewood Paragon and Growth-Chamber Guardian in the Bramble Elves deck to give trample or go fetch another Guardian
That means each one was opened, pick one, pack one, hundreds of times and always, always first-picked
Did you have to limit yourselves at all since you could theoretically just create anything a deck was missing, or did you lean into that freedom
Commander has a ton of powerful ways to generate a bunch of mana, and turning that mana into cards, life, and a Jellyfish Hydra Beast that flies and tramples is pretty much everything you want to be doing in the format
You can create pretty consistent scenarios where you play a room card and unlock the other door: Victor, Valgavoth's Seneschal lets you surveil 2 while your opponents discard a card