Imperium: Horizons
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What do the set codes on common cards mean, and how do I find which card a replacement replaces?
The first digit of a card code is the set (1 Classics, 2 Legends, 3 Horizons) and the letters are the deck (TRIB, REG, UNC and so on). A code ending in X marks a Horizons replacement card; drop the X to get the original card's number. Replacements usually share the original's name.