Suggestion: Introduce a max deck size of around 100-150 to reflect IRL rules
In reality, the rule exists "There's no maximum deck size, as long as you can shuffle your deck in your hands unassisted". I see players playing 200+ cards in a deck in Arena. A deck limit of 100-150 would be reasonable given almost no players could physically shuffle more than this. This prevents situations in Arena where people play 300 card 'do nothing' decks that aim to mill the opponent over the course of over 50 draw steps and drag games on for over 30 minutes.

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unlinkingelm#29692 commented
I'm sick of plying a 60 card deck (in standard) against some guys who have 300 cards in their deck can yal fix this?? It's some bull
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gt2501#15164 commented
Am all in favor of this, I agree whilst technically there is no maximum hand size I think a cap would be a fantastic idea.
Without sounding salty these 200+ card, shut down decks whilst well thought out and constructed, are franky just frustrating to go up against.
No one wants 50 turns of counterspell, counterspell, counterspell, opponent draws new hand, counterspell.........etc.
It's a very cheap way to win when your opponent would rather conceade out of being able to do nothing for several turns.
Am in total agreement that it goes against the spirit of the irl ,"what you can comfortably shuffel" rule