Everyday I'm shufflin'
One problem: my method of shufflin’ ain’t heah. It’s a modified ‘overhand’: I hold the cards vertically and due to slight differences in card sizes, sweat on my fingers, grease on the cards, with one lift I pick cards up from various parts in the deck. These N stacks of M_n cards per stack I put on one side of the set and iterate. I always thought it was a better version of overhand shuffling, but it is not mentioned in the video nor on Wikipedia.