User blog comment:Alpha654/Legendary Cards: What are the Odds?/@comment-28478783-20160922014432/@comment-29191679-20160922021144

Such a circumstance has a 12.5% chance of happening. But after all, what has even the tiniest chance of happening, will happen someday.

Epic cards are similar, but there are chests that are guaranteed to contain them, so less complicated information is required for them.