I've been out of the game for a couple years now but I remember reading about an expansion pack coming out that had been calculated to have a (rather marginal)

I've been out of the game for a couple years now but I remember reading about an expansion pack coming out that had been calculated to have a (rather marginal) edge in favor of the consumer for crack packing. I assumed if there's been one, there may have been another. Unfortunately I can't remember which set this was anymore as I lost all interest in Standard around that time due to power creep. It was some time around 2013-2014 I believe.