Oryx, The Taken King

Flying, Menace
Whenever Oryx, The Taken King deals damage
to a creature, put a Taken counter on it.
Other Nightmare creatures you control get
+1/+1
(When a creature with a Taken counter on it
dies, exile it, then return it to the battlefield
under your control except it is a nightmare
in addition to it's other types and it loses all
activated abilities.)