The Ashen One

Hollow {3}{b} (when this creature dies, return this creature to the battlefield with a -1/-1 counter on it, and it becomes a black Zombie in addition to its other colors and types. You may pay its Hollow cost to remove any -1/-1 counters applied this way, and restore its original colors and types)
When the Ashen One starts to ride, there is little that can stop him.