Best way to accumulate packs?

[BxnnyMxn__PSN]

Playing thru this most recent AS conquest map got me to wondering this. I’ve been buying up the live cards for a while and still have about about 10 cards to go and of course they cost way more than I currently have but it sure seems like just by simply doing these conquest maps that one can quickly acquire packs of cards that may contain some of these (my diamond luck has been horrid) ones that I need. Is there another mode that is good for this or is conquest the way to go? I really haven’t paid any attention to the way that things are rewarded I’m just having fun playing the game really but I’d love to know