Er-Mûrazôr, the Witch King

Ring Hunter — Can attack the ringbearer as if it is
a Planeswalker. The ringbearer gains a -1/-1 counter
if fades out when attacked by any Nazgûl.

If the ringbearer dies when attacked by a Nazgul,
you gain control of the One Ring.

Er-Mûrazôr gives +1/+1 to each other attacking
Nazgûl. If Er-Mûrazôr dies and was damaged only
by human male creatures, return it to the battlefield. Otherwise, exile it.