MSI is partnering with Ubisoft to release a new version of its Z170A Krait motherboard. Dubbed the Z170A Krait Gaming R6 Siege, it features a black and white design and includes a copy of Siege. The free copy also applies to the regular Z170A Gaming M5 version of the board. It's not clear if this applies retroactively, but you can always try.
If you're not familiar with the motherboards, they support 6th gen Intel Core processors, DDR4-3600+(OC) memory, and USB 3.1 Gen2 Type-A and Type-C.
The bundle applies to select countries; it starts today and ends March 1, 2016. Head here to redeem.