[Update]: Small correction: It appears that the friend list has not yet been added and will come with the upcoming "social features" rework.

After quite a long delay, MTG Arena has now finally added a friend list, as well as the ability to challenge said friends to a duel. So if you ever get tired of the meta and the scores of players that require a full minute to play one land, just challenge a friend to a match and you'll be able to mess around with whatever weird deck you want. It's pretty much what Magic: The Gathering was designed around, so I'm really glad they finally brought it into MTG Arena as well!

Besides the ability to bully your friends, this update has also significantly sped up animations in order to make playing more complex or combo orientated decks actually possible. In other words, you will no longer have to burn the better part of your turn by trying to resolve the stack with cards like Niv-Mizzet or Thousand-Year Storm. Now we just need the ability to automatically resolve certain effects so we won't have to click a million times for each +1/+1 counter put on Ajani's Pridemate for example.

The update has also added a variety of minor improvements to the deckbuilder, including the ability to sort by expansion. That last part is particularly relevant now because there is currently a constructed event where you can only use Guilds of Ravnica cards. Mind you, this is still not the much-anticipated Deckbuilder 2.0 the dev team announced a while back, but rather just a bit of an update in order to tide everyone over.

You can read about all of the changes by visiting the official website, though if you're only interested in the Direct Challenge mode and what exactly it offers, you should head on over to the FAQ. Have fun!