Oath of the Gatewatch - leak

The images of a new Kozilek and a couple lands have been floating around the internet this week. Some people claim that these cards are indeed real, what would be a total breakthrough, because images show a new basic land type "Wastes".

So, it is time to speculate what this diamond shape mana may mean. The theory, that I like the most, is you must obligatory spend colorless mana to cast a spell with "Wastes" symbol in converted mana cost. Meaning "Wastes" produces colorless mana and it is not the sixth color.

But then the question is why it was not implemented along with Battle for Zendikar. It would fit perfectly to cards like Ulamog, the Ceaseless Hunger or other. Introducing it in the small set Oath of the Gatewatch might smash the theory presented before. On the othe hand, Phyrexian mana was in small set too..


What do you think?