I 100% agree on that idea, i had various Situations where i played vs Players who create interesting and unique Decks where i got curious how 2 or 3 Matches vs him/her would be. But all i can do is hoping that i meet them 1 day again. Ofc that option would lead to a Problem that there some elite grps or casual grps are built. And becouse that is the case i would ether add the option max 7 games per friend unless you set yourself to private mode (means next friend you duel you are stucked to) and after 4 hours you can move to public play and no private games anymore. Becouse in my opinion we should avoid the Situation that there are 16-18 grps of 6 players fighting each other and new players dont find any enemy. Unless they implement a Clan System so they can play vs clan if neccesary.

Yes with sideboard switching!

This would be awesome! Any word on whether devs will add it?