Etali, Primal Conqueror + Arlinn, the Pack's Hope + Battle = free back side of Etali
Etali was cast from the command zone transformed instead of the back side of the battle my opponent should have been able to cast for free (Awakened Skyclave), which I think was due to them having used Arlinn's +1 (cast creatures with flash, they enter with a +1/+1 counter) and the spaghetti code of Arena led to it allowing my opponent to just cast whatever back-side creature spell they wanted with the assumption that surely a double faced creature couldn't be cast from outside of the hand and with flash...
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Phyley#87598 commented
The exact same thing just happened to me.
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ManaganKirst#37825 commented
That probably was against me. I've played against similar Etali decks before but never seen that happen.
I'm going to try to recreate it against sparky since arlinn's +1 was my first guess as well, will follow up whether or not I can get it to happen again.
EDIT: apparently there aren't bot brawl matches, I've sent you a friend request if you're fine with trying to recreate it.