Much like the undead, during the Halloween season (October 28th through November 1st) these items will become extra powerful, receiving a boost to their ratings.
As part of a new event within FIFA 17, Ultimate “Scream” cards have been added to the title.
From October 21st to October 28th, special cards may drop from packs, featuring upgraded ratings and unique card designs.
The boost ends on November 1st at 10 a.m. PT, so make use of it while you can.