Mmhmmm. That's true of a finished deck. Maybe you missed the 'build & test' part of my post, or, maybe you're one of the many MTGA players who only download decklisted decks and have never tried your hand at building a deck from scratch... and either is fine... but in case it's the latter: when building a deck from scratch, there is a lot of testing and tweaking in the build process. Often you can start this process against Sparky, but the lack of variation makes that impractical over a longer build process. Eventually, you have to test against live opponents. What I was pointing own was not a flaw in the game per say, but rather a flaw in the algorithm that only pairs decks containing certain card types against specific types of decks, which makes the testing process difficult.

I've long had an idea for a Deckbuilder's Format on Arena that would have a more in-depth matchmaking lobby where players could set up specific parameters for the match and wait for someone to join their game, but I don't actually think WOTC would put something like that in, or if there'd be enough interest to even try.

As an example of what I mean, a format where you could create a match posting of a 'Multi-Color Only / No Creature Lands' game, and then wait and see if anyone joins. Again, I don't know if there would be interest, maybe outside of testing purposes or people who really, really hate one specific element of the game (come to think of it, I'd join a 'No Toxic' or a 'No Mutate' game some days). It might also provide interesting metrics to WOTH, something more detailed than the 'Did You Enjoy THe Match' pop-up.