Kythan, Lord of Black

Zombie Warlord (This creatures power and
toughness are equal to the number of zombie
creatures you control.)
When Kythan, Lord of Black enters the battlefield, destroy target creature. At the
beginning of your next end step, that creature is returned to the battlefield under your control and
is a zombie in addition to its other types.
"Not a soul will remember this war." -Kythan