I did it by hand with a scissors. I was losing my sanity every night for months trying to keep my newborn from crying. Printing tons of decks, cutting and sleeving was the kind of thoughtless work that fit in that time period.

Can't speak to OP but a Cricut or budget equivalent cardstock cutter is a M:tG hacker's best friend. That and an unlimited supply of Modge Podge.

A guillotine or rotary cutter and corner punch are probably faster but nothing's more satisfying than a whole deck of precision cut cards.