Cadaver Custodian

When Cadaver Custodian enters the battlefield,
you may return target creature card from your graveyard to your hand.
Exhibit {1}{b} ( {1}{b}, Exile this card from your graveyard: Create a token that's a copy of it, except
it's a colourless artifact with no other card types and
no mana cost. Exhibit only as a sorcery.)