Since I lack the skills to riffle succesfully, I usually sort and shuffle based on the properties of the game at hand. I usually sort somewhat randomly to stack

Since I lack the skills to riffle succesfully, I usually sort and shuffle based on the properties of the game at hand. I usually sort somewhat randomly to stacks, where the number of stacks is larger than the regular set in the game (but < 2 times the regular set). After that, a few quasi riffles and I feel I've made the next game sufficiently random from the sorting that the last game gave. Wonder if I could wrap my math around formalising that.