Vez'nan, Catalyst of Evil

Whenever a non-artifact creature leaves the battlefield, you may pay {3}{b}, if you do, put that creature onto the battlefield under your control,
if it would be put into a graveyard exile it instead.
{5}{r}{r}:Vez'nan, Catalyst of Evil becomes a
7/7 demon with flying and trample. Activate this ability only if an opponent has five or more
creatures in their graveyard.