I'm quite familiar with a few methods of cards, primarily Riffling and Mongean* shuffling. The issue I have with those is that the Riffling shuffle tends to bend cards and wear them out, as well as not working well with a large deck. The Mongean method isn't particularly good at shuffling large decks either.
Unlike this thread I'm not dealing with a well organised deck, but I am dealing with a large deck (80 cards plus).
I've considered cutting the deck in two first, but that then takes twice as long.
What is the best method for shuffling in this case?
*Instead of moving one card at a time, I move a random number.