Sehn-Kharr, Horde Acolyte

Champion a Wizard (When this enters the battlefield, sacrifice it unless you exile another creature
you control. When this leaves the battlefield, that card returns to the battlefield.)
When Sehn-Kharr champions a creature each opponent loses 5 life.
{1}{u}{b}{r}: Put Sehnn Kharr into its owner's
library third from the top.