My favorite game is an old gambling card game known as canasta in which you try to go out before you opponents by way of making runs of seven cards known as Canastas. You can either have a pure canasta for instance one which consists solely of 7 for example or an impure canasta which might consist of say 6 eights and a wildcard. Now you can either designate Aces or ones or both or one or the other as the wild cards and this must be done prior to starting the game(hand).
You can play with as few people as three or four all of the way up to multipule teams of 5 or six. The caveat is that you have to have one deck of cards per player so you can tmagine that after two or three players if you aren’t a very dexterous person you’d run into issues shuffling the potentially massive number of cards implied.
Porter's Pebbles 