I just re-downloaded MTGArena and I'm a bit sad friendly challenge hasn't received the updates needed for me to invite my friends and feel good playing with them:

Have wins count towards Daily and Weekly rewards (not only quests).
- Progression in this game requires enough engagement as it is.
- You shouldn't ever feel that you are "losing gold and XP" for wanting to play with a friend rather than online match

Enable a re-match interface
- After finishing a match with a friend you go back to the menu, why not keep the challenge open and ask you to re-select deck?

Allow for borrowing decks from your friends (in the challenge)
- I understand this is a potential risk to people expending less on decks (if their interest is more to play with friends than online)
- However, this change would mean a lot of new player influx from us (that we did the daily grind) to invite them to play

I feel that all these things stand in my way from inviting friends to MTGArena. A lot of Online Card Game implemented stuff like this and it only received good praise and an increased in user activity to my understandment