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Planar chaos booster pack contains 15 cards per pack. Distribution is 1 rare, 3 uncommons, and 11 commons. Some boxes contained packs with two rares. Since the second rare was in an uncommon spot, this had the effect reducing the amount of uncommons in certain boxes. These boxes appeared to have been evenly distributed amongst a case (six boxes). If you recieve packs from these boxes the distribution would be 2 rare, 2 uncommon, and 11 commons. Released on February 2, 2007, Planar Chaos is the second set in the Time Spiral block and is an expansion set, codenamed "Crackle". The symbol for Planar Chaos is a Möbius strip. The set contains 165 black-bordered cards (50 rare, 55 uncommon, and 60 commons).
The temporal stresses being applied to Dominaria have expanded, causing multiple parallel universes (versions of Dominaria where history played out differently) to merge into the already colliding past-present-future of current events.
Designed by Bill Rose (lead designer), Matt Place, Mark Rosewater and Paul Sottosanti, and developed by Devin Low (lead developer), Zvi Mowshowitz, Brian Schneider, Henry Stern and Mike Turian, Planar Chaos was tasked with representing the present in a set focused on the cycle of time.
The design team considered a number of ways to represent an alternate present, including the introduction of purple as a new color.
Eventually, the team chose to represent alternate realities where elements of the color pie were shifted, placing spell types and abilities into unusual colors. These alternate realities were epitomized by the set's 45 "Timeshifted" cards. Unlike their predecessors in Time Spiral, these cards were direct reprints of previous cards, save for shifts in color, land or color references in card text, card name and creature type. Timeshifted cards in Planar Chaos appear in an altered version of the modern card frame with standard set symbols.
Timeshifted cards in Planar Chaos are also distributed differently. In each pack, three common cards are of the Timeshifted variety and an uncommon is replaced with either a timeshifted rare or uncommon. Foil cards, instead of replacing a card of the same rarity, replace a common card. As such, it is possible to receive a booster with up to three rare cards: one normal, one foil and one timeshifted. The uncommon timeshifted cards show up in a 3:1 ratio to the rare timeshifted cards, so the average out of 4 boosters is 3 uncommon and 1 rare timeshifted card.
The only Planar Chaos specific keyword mechanic is Vanishing, an updated version of an older mechanic, Fading. Vanishing uses time counters to interact with Time Spiral cards and induces sacrifice at the removal of the final counter to make the mechanic more intuitive than its predecessor.
The Time Spiral keywords of Suspend, Flash and Split Second all returned in Planar Chaos, alongside the "timeshifted" mechanics of Echo, Flanking, Kicker, Madness, Morph and Shadow. Planar Chaos marked the first appearance of spells with Echo costs that did not match their casting costs, as well as the first appearance of single color split cards.