5th copy
Yesterday I opened an All Will be One pack from the store and there was a copy of Whisper of the Dross. I already have 4. Then today I bought another Alll will be One pack and there was a copy of Duelist of Deep Faith. I already have 4 of those. Is there protection from 5th copies or not??? I heard there is. So is this a bug or what?
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[Deleted User] commented
Duplicate protection is only for rares and mythics, and only when opening packs. Excess commons and uncommon contribute to the vault instead. +0.1% for commons and +0.3% for uncommons. Should you get a fifth rare or mythic in some way (as individual card reward like from Midweek Magic, by drafting or playing sealed, etc.) or because you have all the rares and mythics in the set already, you get 20 gems for a rare instead, or 40 gems for a mythic.