Creatures only exist on the battlefield; in every other zone they are creature cards.

Many spells and abilities affect creatures in some way or another. When text on a card refers to creatures, it means creatures on the battlefield. This is because creatures only exist when on the battlefield. When a creature card is in any other zone, it is just that: a creature card. For example, let's say that you control and you have in your graveyard. If you cast and choose to exile the Kemba's Skyguard from your graveyard, the Corpse Lunge will only deal two damage. Honor of the Pure will

Read more.

Corpse Lunge deals damage, the exiled creature card does not.

As an additional cost to cast , you exile a creature card from your graveyard. When Corpse Lunge resolves, damage equal to the power of the exiled creature card will be dealt to the targeted creature. It is important to note that the source of this damage is the Corpse Lunge itself, and not the exiled creature card. For example, if you cast Corpse Lunge targeting an and exiling a , the Inquisitor will be dealt two points of damage. It doesn't matter that the Inquisitor has protection from zombies

Read more.