Does anyone actually enjoy arena anymore? Every game consists of players who spam minions and cheap removal which decides the game by turn 7 or 8. So even if you take back the board, there is so much opportunity to do massive face damage that you cannot come back.
I’d suggest to raise the health to 40. Balance some spells and minions. Arena cost money or gold. It shouldn’t be this massively unbalanced.
From minions/spells that wipe board for minimal mana, to players spamming down three 4/1 minons on turn three. It’s just not fun for games to be this massively imbalanced where one or two plays decided who wins.