You do have emotes where you can congratulate an opponent on a win and other such one liners, but generally even though the game is called MTG: Arena and it is an online game with real life opponents, as you play you barely even make that connection
The Walls of Ba Sing Se The Walls of Ba Sing Se are a sight to see and nearly impossible for red players to remove
The first is Strata Scythe, which allows you to Imprint a land from your library and give the equipped creature +1/+1 for each land on the battlefield with the same name
This can be claimed if you cast a spell anywhere other than your hand before your end step
Just on the grounds of simple accessibility alone, getting more copies of this card into the hands of Commander players everywhere makes this the best mythic of the set, and I'd argue it's not even close
It's a plain fact that while some of the oldest instants and sorceries are renowned as some of the best MTG cards in the game, almost all creatures from the same period have been left in the dust