Allow Voluntarily Showing Your Hand
In the official rules of Magic, it's explicitly legal to share private information with other players, such as showing your hand (MTR 3.13). Not having the ability creates a different play experience in Arena than in paper, and can lead to players engaging in annoying behavior such as repeatedly flooding "Good Game" when they know they have a win due to a good draw, but no way of proving it but playing it out.
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