Filtering for 4 copies does not show all cards you have 4 copies of
When you build a deck and and use the "4 copies" filter in the advanced search options it will filter out certain cards that you have 4 copies of.
The card I noticed was Llanowar Elves, which disappeared even though I have four copies of it. I suspect that it is counting extra copies collected from other sets. So since I have 4 copies of Llanowar Elves from Foundations and 4 copies from Dominaria it will not show Llanowar Elves when filtering for 4 copies since 4 =/ 8
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