My Set cube for Khans of Tarkir.
This is the 4-2-1-1 method. This means 4 commons, 2 uncommons, 1 rare, and 1 mythic.
A few cards have been cut out of the cube that are duds. Stuff like Shatter, Lens of Clarity, and Ugin's nexus for example were all cut from the cube because they were just straight blanks in limited. I'd rather have fewer cards to that are utter blanks, and give some of the lesser cards to shine a bit.
The format is deep and a lot of fun. I wanted to keep the experience as close to drafting a box of KTK as I could, while improving the format by getting rid of some of the duds. I didn't want to remove all the "bad" cards, but the worst of the worst that don't see any play make sense to go.