From the preview:
Sometimes slaughtering your opponents is the result of brute strength. At other times, a Tribe has to rely on their quick-thinking, inventiveness, and ingenuity. In the Um’Kator Tribe, everyone pulls their weight. They detest laziness and see it as the ultimate sin. While others lie in rest, the Um’Kator approach slowly, silently, with blades drawn, and slit their enemy’s throats in the night.
The Um’Kator rely on their flexibility to succeed in battle and to keep fresh meat in the bellies of the young ones of the Tribe. In battles, they have the ability to manipulate the dice, turning a glancing blow into fatal wound. The opponents of the Um’Kator may think they understand them. They may think they even have a physical advantage. But the Um’Kator are masters of trickery, and what you see of them is only what they want you to see. The cards in the Um’Kator Tribe deck provide them with options. They can choose to active the ability that best suits the situation. They are able to cycle through the deck quickly and find what they need, when they need it.