Typical sore loser answer and behavior. You lost, get over it.
EDIT: I noticed you edited your own comment just after I answered it. You changed the last part of it from "this new rule is bullshit imo." to "commanders does not enhance the game in my very humble opinion. ". Pathetic.
It's one thing to lose because one has been outplayed. In that case I'm ok to lose and am usually quite gracious. It's another thing to lose due to a new feature of the game with which one is unfamiliar, and when one would otherwise be the victor. Surely you can empathize with that?
Well, I think the only person you can blame for your unawareness is yourself, wouldn't you agree? You surely could have seen the Commander option in settings and if you did not know what it did, you could always check it on the wiki.
I understand this might seem a bit much... but hey, you didn't do it and preferred to learn it the hard way. That's fine as well =)