Liliana, Spark Revoked

When Liliana, Spark Revoked enters the battlefield, you may exile any number of creature cards from your graveyard, if you
do, you get that many 1/1 black zombie token creatures.
When Liliana was flung across the multiverse when running from bolas, she reached the castle of the elders, where her spark was revoked, and she was forced to stay on Donaution, until she earned her spark back.