The Unity, Master's Army

Whenever a creature dies, you may exile it. If you do, create a 3/3 {g}{b} Mutant creature token.
{5}{b}{g}: Return a creature card exiled with The Unity to the battlefield under your control. It’s a Mutant in addition to its other types.
-
"The Unity will bring about the master race. Master! Master! One able to survive, or even thrive, in the wasteland. As long as there are differences, we will tear ourselves apart fighting each other. We need one race. Race! Race! One goal. Goal! Goal! One