Conception and Design
In his preview articles, Mark Rosewater described Time Spiral as an expansion focused on the past, with its successors, Planar Chaos and Future Sight, to be centered around the present and future respectively. This design was achieved through keywords and mechanics that interact with time, as well as cards based on those in previous sets, to promote a sense of nostalgia. Time Spiral was codenamed "Snap" during development.
The size of the set had been in dispute prior to release, as Wizards issued two different sizes for the set, 301 and 422. Retailers were initially told that the set would include 422 cards; Wizards of the Coast sent a retraction email explaining that the set would in fact be 301 cards in size. The set size was then confirmed to be 301 cards, with 121 commons, 80 uncommons, 80 rares and 20 basic land. The confusion came about because Time Spiral was released with a 'sub-set', 121 timeshifted cards in addition to the 301-card basic set. After the set officially went public, Rosewater said that Wizards of the Coast had released the apparently conflicting figures by accident, but ended up just as happy to have done so after seeing the speculation they fueled.
Time Spiral booster packs marked Wizards of the Coast’s new premium card distribution method, where premium cards replace commons, as opposed to replacing a card of the premium's standard rarity.
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