The cube in its current state is at around 180 cards native to Theros, another 180 outside of Theros, meaning it's become extremely weighted towards non-theros cards. To combat this, I'm going to cull the entire cube down to 270 cards. I'm expecting around 170 native Theros cards, around 100 non-native Theros cards (which, when you remove the ~40 dual lands that don't need to be on Theros, having 60 nonland non-theros cards seems about right to me).
The CullingFocusing as I said on culling any cards specifically from outside of Theros that I don't think are necessary, as well as most of the non-creature non-enchantment cards. With less space it's all the more important to make sure that the core of the draft (creatures) and the core of theros (enchantments) stay consistent.