Coldsnap is the thirty-ninth Magic expansion and was released in July 2006 as the third set and second small expansion of the Ice Age block, replacing the Homelands expansion as a member of the block. The prerelease events for this set were held on July 8–9, 2006.
Coldsnap contains 155 black-bordered cards (40 rare, 55 uncommon, and 60 commons). Its expansion symbol is a depiction of three icicles. When Coldsnap was initially announced, Wizards of the Coast claimed that the set was a "lost design file" only recently found. Because this statement was taken seriously, Mark Rosewater later had to clarify that it was a joke.
Coldsnap had the shortest-ever design, at six weeks. R&D made a conscious effort to hit on every standout theme in Ice Age and Alliances to give the set the necessary “retro” feel. This included cumulative upkeep, allied colors, pitch cards, old characters springing to life and land that doesn't tap for mana. The 'snow-covered' supertype changed to 'snow' and expanded its use to nonland permanents. The new Recover mechanic captured the feel of "graveyard order matters" without requiring meticulous tracking. Another new mechanic was Ripple.
Because most sealed tournaments would use only Coldsnap cards due to the rarity of Ice Age and Alliances booster packs, as a means of making frequently recurring commons more valuable, several common cards (the "kindle" and "surging" cycles) were printed that rewarded players for using multiple copies in their decks, making them more desirable.