For the Fourth Edition set, released in 1995, WotC contracted United States Playing Card Company (USPCC) in Cincinnati, Ohio to manufacture a portion of the cards, along with its primary printer, Carta Mundi, which was located in Belgium
As of August 20, 2006, Coldsnap is tournament legal in Standard, Extended, Legacy, Vintage, and Ice Age Block tournament formats
Then again, its not like Biorhythm needed any help
It was never part of any official product line or promotional event allegedly printed as an internal test card, it accidentally received the Pre-Release stamp, which was typically reserved for early promo editions
Rulebook Showcase Clattering Skeletons If you grew up with Dungeons & Dragons rulebooks from the 70s and 80s, these cards hit that perfect note