The Miracle Cactus is a rare species of cactus found in the Motara Desert by Turaga Mirama. It is said to be able to cure any poison, but at a cost. Gaining the full effects of the Miracle Cactus shaves ten years off the user's life. Mirama's Miracle Cactus was up for sale in Po-koro for a time, but no one bought it so it was taken off the shelfs. Mirama later gave part of it to Jasik to keep him alive. The rest was buried with Mirama when he died.
The phrase "Miracle Cactus" has since become a meme on BZPower, with many role-players adding it to their signatures or name-dropping in-character.