Historic Brawl
First of all, this system is incredibly user unfriendly. When I go to submit a ticket/bug, it shouldn't run me around to multiple pages, especially especially when the final page doesn't give clear directions.
My issue occured in historic brawl, where i was playing a Rusko deck. I had plenty of mana (I counted and double counted) to play Karn's Temporal Sundering. There were no effects that prevented me from playing it and I was in my main phase (it's a sorcery.) Despite all this, I was unable to play it. this lead to me effectively passing my turn. I conceded shortly after because my opponent, got to cast their single copy of Karn's Temporal Sundering, which lead to them gaining an insurmountable lead. Obviously this isn't ranked because it's historic brawl, but ya'll have to do better.
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[Deleted User] commented
Did you have a legendary creature or planeswalker in play?