Opening Foundations Packs giving gems instead of cards even though there are many rares I have not collected
As others have said, but I want to reiterate, I've opened numerous Foundations packs and received gems in leiu of rare cards despite having a lot of rare cards yet to collect. Collecting the cards is one of the remaining satisfactions in the game. I am considering uninstalling and spending my time and money in less frustrating ways.

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Manizno#87381 commented
Is there a resource to clarify which cards can be pulled from packs?
With regards to rares specifically, there are some that I was pulling out of packs, so have 1, 2, or 3 copies of but have stopped pulling them from packs. Occasionally this will make sense, like I already had 3 copies of Vivien Reed so got another and stopped pulling those (I realise it's mythic). But in many cases this is not true. IE I don't have a playset across releases. And to further confuse matters, there are cards like Phyrexian Arena that I have two play sets of.. fair enough it's different art but still a bit annoying. On the other hand I also have two play sets now of Painful Quandary which has the exact same artwork. All in all collecting this set makes no sense whatsoever and I'm miffed. -
sparksfamilyvalues#95319 commented
There is a large starter set of cards in Foundations that are not found in Boosters. You will need to craft those if you want them.