How to Lose in cEDH

Summer is starting to wrap up, and as I sit back and pack up for my new adventures in graduate school I'm left thinking about all the Magic I was able to play back home in Santa Fe these past few months. Nights spent ambling around the local game store tables, hours of debating every facet of the format, from the seemingly uncounterability of creatures in the current meta to the viability of stax, all the while booster packs wrappers decorated the countertop space. I've gotten to play a lot of cEDH recently, and it's been one hell of a ride, but if I learned anything, it wasn't how to win, but how to lose.
To clarify, I'm not saying I spent this summer trying to figure out how to be worse player. That would be a poor use of my time. Rather, I spent it trying to figure out every possible way to learn from my losses. I'm not quite at the 50% winrate threshold yet for my games logged, so statistically speaking I'm still more likely to lose than not. Why not put those games to good use? Noting what went well in a game you won will be informative, sure, but there's nothing quite like jotting down the challenges of a loss for further use. The strategy of cEDH continues far beyond the moment we all pack up our cards and leave, after all.
Regardless of whether I win or lose a game, there are two primary things I try to keep track of: what happened and what didn't. Between those two categories, you've just about covered every possible configuration of games, so the information may get a little bit muddled if you aren't careful, but there's a method to this madness.
The First Big Takeaway: What Happened
Understanding how things work is important: that's the "what happened" aspect of playing Magic. In my game log, these are the columns of "Opening Hand Size," "Game End Turn," "Win/Loss," "Turn Order," "Opposing Commanders," and "Notable Cards." Right away, this provides excellent information about how your deck operates. Does a lower opening hand size correlate with a lower win/loss ratio, or can you mulligan aggressively? What about turn order: you may think your deck is midrange, but how does that play out in theory? While intuition can take a pilot far, crunching the hard numbers will often be the key to what we're all chasing in the end: incremental advantage.
In my case, I spent this summer playing one deck and one deck only: Grand Arbiter Augustin IV
My point here is that, regardless of the list, math doesn't lie. You may think you know a list like the back of your hand, but memory can be a bit finicky, so it's never a bad thing to back it up with extra data. Had I not run the numbers, chances are I'd still be hesitant to mulligan past five, and who knows how many games that would've cost me.
Beyond the inwardly focused information which this can offer (stats like "Opening Hand Size" or "Notable Cards"), tracking losses also provides a wonderful snapshot of the context of your games. Without sideboards in cEDH, decks need to be built with a greater mainboard consideration towards the rest of the field. There's no opportunity to pull out a silver bullet in game two, so it's all up to us to make the most of our ninety-nine.
Going back to the speed of a deck, this becomes particularly noteworthy when talking about windows of opportunity. A TurboNaus deck may be built with the goal of winning by turn three, but, if you find yourself losing a significant portion of those early games to other decks, there might be a hidden message about pacing yourself a bit slower so as not to burn out. Goldfishing games can teach you the ropes, but losing in the training grounds of your LGS can reveal opportunities for bolstering hidden strengths which you may have never even noticed.
The Second Big Takeaway: What Didn't Happen
The second key aspect of a game worth considering is what didn't happen. This is the part of Magic that is more easily dismissed, and it's also the part that's more easily obscured by emotion. It can be frustrating to lose, especially when the game was yours to win and all you needed was one more card.
Instead of kicking yourself over a misplay, or bemoaning that you never drew that one more card, it's instead worthwhile to spend some time on the constructive exercise of evaluating both why something didn't happen, and what would've been done differently if it had. Going straight to "why didn't I win" is too loaded of a question, so start small and work outwards. If you lost a counter war and that one more card needed to be a Force of Will
Part of playing cEDH is understanding the cooperative element of the game as well, considering it's often times incredibly difficult to eke out a win in a purely 3 vs. 1 experience. When it comes to losing, this means understanding your role as a communicator in the game: what information didn't I share? Hidden information is a valuable resource, no doubt, but so too is the potential for politicking by sharing information. Think of any time you have backed up an opponent's counterspell to stop a Thassa's Oracle
Overall, the "what didn't happen" part of a loss can largely be summed up by these two categories: what didn't my deck do, and what didn't I do. Identifying these occurrences and understanding the difference between the two is a crucial step towards increasing your odds of success, both as an individual player and as a specialized pilot. cEDH isn't just about playing a deck, it's about playing your opponents as well. Take note of how the cards were used in a social setting to divert attention.
Rigorously Evaluating Decklists
We've talked about understanding a deck quite a bit, but times change, and so too must our lists. If losing has taught me anything, it's that modifying a list can be incredibly deceptive, and there most definitely is a wrong way to go about it, so let's get into it.
A wise cEDH primer once said you can't rigorously evaluate individual cards. So, why not evaluate all of them simultaneously? It may sound a bit crazy, but understanding the way everything works together as opposed to individual functionality is actually a feasible task, one which brings with it a crucial foundation when it comes time to update a decklist.
Overall, decks are built like machines in that they are frequently assembled from compartmentalized modules which are held together by and overarching structure. Individual card functions - interaction, mana accelerant, etc. - aren't just a descriptor of how that one card functions on its own, but also the list of other functionally similar cards which can fulfill its role if variance throws a different card your way. Mindbreak Trap
"But wait!" I hear you shouting, "There's no other card that quite does what Ad Nauseam
Wrapping Up
There are a lot of things to learn from losing a game of Magic, both about yourself and your decklist. cEDH is a four-player format, after all, so odds are you'll gain more experience from losing than you will from winning. I encourage y'all to track your games, take a deep breath, look at the big picture, but more than anything have fun with it. I know I sure have.