This idea is a combination of Nudie Run with an untimed MP ladder. You get 3 new level 1 chars when you start your run, any race and class. These are the only chars you can use in the run. You can only use items earned in the current run. (Each char starts with their usual default item.) When you win a battle, your chars level up and you get a chest. The chests follow the same sequence as the normal MP ladder except that the pink chest is #18 instead of #20. The matchmaker ignores ELO and instead matches you against someone at the same point in their run: same number of victories, same level, same number of items. When you reach the pink chest, your run is over and your chars (now level 19) and all items gained are added to your regular collection. You can start a new run if you want. You can abandon your run at any time. Any items gained will be moved to your collection, but you will lose your chars from the run. You can spend as long as you want to complete your run. You can only start one run per day.
