The current state of Magic

[sadface]

That gif just confuses the shit out of me, honestly. I'm not really understanding the rotation period.

Standard rotates once per year, one year (i.e. 4 sets) at a time. When the fall set of 2017 (Ixalan) is released, all sets older than the fall set of 2016 (BFZ, OGW, SOI, EMN) rotate out of Standard. When the fall set of 2018 is released ("Soup"), all sets older than the fall set of 2017 (KLD, AER, AKH, HOU) will rotate. And so on.