Helvault

{1}, {T}: Exile target creature you control.
{7}, {T}: Exile target creature you don't control.
When Helvault is put into a graveyard from the battlefield, return all cards exiled with it to the battlefield under their owners' control.

The List

From the Vault: Lore

Dark Ascension

Helvault’s first and third abilities are linked. Similarly, Helvault’s second and third abilities are linked. Only cards exiled as a result of Helvault’s first or second abilities will be returned to the battlefield by its third ability.