But if you want to get a 'somewhat' higher chance of getting a gold-foil card or a legendary then it's probably better to open them with some potions in hand (rarely works on me though T_T). I don't suggest buying the potions but the reward potions you will get from the daily quests is enough.

Same here. Not really a fan of the potions so far. I opened a pack while using a legendary potion I got from the daily quest and got really mediocre cards worth around $0.20.