Cemetery Reaper
{1}{B}{B}
Creature -- Zombie
2/2
Other Zombie creatures you control get +1/+1.
{2}{B}, {T}: Exile target creature card from a graveyard. Put a 2/2 black Zombie creature token onto the battlefield.

* Cemetery Reaper grants +1/+1 to all other Zombie creatures you control, not just the ones its ability puts onto the battlefield.

* The creature card in a graveyard is exiled as part of the activated ability's effect, not as a cost. If that card has left the graveyard by the time the ability would resolve, the ability is countered and you don't get a Zombie token.