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So, just so that I understand clearly, you are buying the "+100% mystery gift" potion (5 charges) every five days (for ~ 6,000 DEC each potion)? And what happens each day? Today I got a message that I have "two reward cards waiting". Are those "mystery" drops WITHOUT the potion? I may be willing to try at least one option to see what happens.

Yes that is what I am buying. It is 6,000 total for the 5 mystery gifts.

Sometimes your gift will be a pack of cards, sometimes just 1 card, sometimes it will be gold foil or legendary charges.

I think your 2 reward cards showing was likely from your quest yesterday, that has been happening to me as well the past few days when i log in, but you are not getting 2 more cards there because you already got them, im sure they will fix that unneeded visual soon.

Cool. I placed - for the first time, and by a stroke of luck - 16th in my second gold tournament last week, and the prize for 16th was a substantial 6,200 DEC! So i went ahead and purchased a "100% mystery gift" potion, based on the luck you have had recently. Let's see what happens... If I do get a massively high-valued card (like the "Archmage Arius" (Level 1) that you go) I would likely sell it and buy additional 100-pack "Untamed" pre-sale promo sets. The two main reasons for that would be : ( 1 ) I enjoy the process of opening the cards (ex. get some pizza and beer and make an evening of it), and ( 2 ) the sheer number and UTILITY of the cards I would get in the 100-pack promo sets would actually end up being worth MORE in the end, when you consider how much you will use all the gold and legendaries into the future. Yes, of course it's nice to have that lovely "Archmage Arius" in your collection to look at, and you seem to have a bit more $$$ to throw around at the game (all power to you). But for me, who is trying to maximize return on a limited budget, I would go for usability over collectibility at this point. Just my personal opinion...