Some games come with gigantic stacks of cards that I find hard to mix with card-friendly methods. Games like Ark Nova, Clank, Hogwarts Battle have unmanageable decks but I hate bending the cards.
A good way to shuffle large decks in my opinion is to get some sleeves an den learn to Mash Shuffle. Here is a video about this on YouTube. Depending on the form factor of your cards it may be tricky to get fitting sleeves, but if you do it's very much a game changer.