Yuri, Adolescent Necromancer

When Yuri, Adolescent Necromancer enters the battlefield create 2 2/2 black zombie creature
tokens
{1}: Exile target creature from your graveyard then
create a 2/2 black zombie creature token. If there
are no creatures in your graveyard and you
control no Zombie creatures flip Yuri, Adolescent Necromancer.
"Necromancy is the darkest magic..."