Been putting this off for way too long, so here's the official entry confermation thingy. Since there's quite a bit to the format, I'm just going to restate the basic idea of it and hope everone interested will check the link.Basics
Incarceration is huge. As in a fully staffed game will take a total of thirty players. Oh yeah that's a lot players. Incarceration is the unholy offspring of a bunch of different formats: Elder Dragon Highlander, Two Headed Giant, Emperor, Planeschase, and the as of yet unreleased Archenemy. If you want something crazy, epic in scale, and want to kill an entire day, this is for you.
The object of the game is to escape from your planar prison to return to your frolicking around the blind eternities. In order to do so, you must win your keys from opposing planeswalker groups in order to free yourself.community.wizards.com/magicthegathering/...
This thread will also be the offical Q&A, so ask away.
Edit: Sorry, messed up link.