This article series documents the price changes of cards in print. We will track how cards go from release to its time out of print. We're currently tracking nine sets: Theros Block (Theros, Born of the Gods, and Journey into Nyx), Khans of Tarkir Block (Khans of Tarkir, Fate Reforged, and Dragons of Tarkir), Magic 2015, Magic Origins, and Modern Masters 2015 Edition. A Standard set runs as long as it's Standard-legal, whereas non-Standard sets will be run as for as long as deemed necessary.
This will be updated every Monday and Friday. The Monday update will follow the Magic events on the weekend to see price changes as a result, while the Friday update will track any changes before the next series of events. The prices come from TCG Player’s median, tracking cards valued at $2.00 USD and up.
There will be upcoming changes that will be implemented periodically throughout this time until Battle for Zendikar is brought to this article series. Feel free to comment about the changes.