Over and over again, the number one question you see in any MTG:EDH forum is "What commander should I build next?"  Commander, the most casual and fun format of Magic: The Gathering, is a bit more involved than other formats. You have to build a 100-card deck, and every card has to be unique except for basic lands. Plus it allows anything - barring a short ban list - from any expansion set over the years; the game is rapidly approaching its 30th anniversary. So it has one of the biggest available card pools but also the most complex deck-building requirements.        On top of that, the average EDH game is going on for at least an hour, maybe two or three. This means that to test a deck in live play, you have a full-time week invested just to give it a couple of dozen games before you can start fine-tuning it.  What we're saying here is, building an EDH deck is a huge commitment. It takes time to construct and sleeve 100 cards, and it sucks when you find out you hate a commander and have to…