I got an email with the key and a message that it's in open beta.
Then 3 games in, autoresolve sacrificed my creature and used that to kill an artifact on the board, which was mine, without asking. This is gonna need some work, because otherwise just passing all the phases of the opponents turn when nothing is happening will put me to sleep. The board UI is pretty cluttered, lands are pretty and all, but maybe just replace them with symbols ? And not even a basic MtG tutorials is definitely not going to win them new players.
Unless you are have a real MtG crush, Eternal is ATM the superior game, even if niche.