Cemetery Reaper grants +1/+1 to all other Zombie creatures you control, not just the ones its ability puts onto the battlefield.
01-10-2009
wotc
A "creature card" is any card with the type creature, even if it has other types such as artifact, enchantment, or land. Older cards of type summon are also creature cards.
01-10-2009
wotc
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 doesn't resolve and you don't get a Zombie token.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.