Ok, so there are a few things weird going on with this week's cycle. First of all, it's Tribal, which is something Wizards has said that they aren't going to do much anymore. Second, it's a colored artifact. (Not that weird these days, but when I created this card it was.) Third, WTF is a Skarren?!
Well, to answer your ever-so-well-put question:
The Skarren are a nomadic barbaric race from the Plane of Avadnu
One of their most prized weapons is the Thar-chak. Which makes it better if one of them is wielding it. I started making these cards about 8 years ago for my first set: Violet Dawn.
The world was created by some friends of mine in the early 2000's and I latched on and made a ton of cards based on the world. Enjoy the week!