After most recent banned update. Playing a Vivi/Thousand Year Storm deck. During my turn I was unable to activate Vivi's ability to obtain Mana. It didn't even register that the card had an active ability. Opponent also did not have any cards on the battlefield that would have prevented this usage. Accrued on Arena on 6/30/25 @ approximately 1:30 pm PST. Android phone in use to play Arena.