Hi,
This is not the first time that I get a M20 Booster Pack Non-Duplicate guaranteed, and end up with a duplicate card. If my memory isn’t playing tricks it was the 3rd time I gor this same card.
It was the 1 rare card booster. Forgot to mention.
That’s because there are only 4 different cards in this specific booster. If you have all of them of course you get a duplicate.
Never checked that… my bad.