(you need an account to see links)
Basically more intense ARAM (though not quite All Mid). You roll a random champ, lane, summoners, skill to level first (and yes, you level this skill first over your first ultimate point at 6) and items to build exactly in that order (if it means building third tier boots first, you better build them third tier boots first).
It's fun shenanigans really. Carrying with AP Rammus 3v1 midlane "Let me taunt you under turret motherfucker" has never been more fun.
Edit: Also tells you how to set up masteries. So you can essentially be Jewish Teemo at 1/1/28 mastery.