Opponent has too many cards?
In a ranked Arena match, my opponent showed a library of nearly 200 cards, as they chose to keep or mulligan, I watched the deck grow in size with an odd animation.
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Myrkr Jör#69803
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DAC169#34537 commented
MtG only states a MINIMUM decks size. Officially, maximum deck size is "as long as you can still shuffle" which Arena translates to 250.
That animation you're seeing after they mulligan is the deck "shuffling."