Monster Mage and Bonemancer, are required to play Horrid Skeleton, Skeletal Warrior, and Giant Skeleton, and can heal Ghoul Lord and Savage Ghoul. However, be careful with this card--you might accidentally send your best cards to the grave forever!
Strong against: graveyard-emptying decks.
Weak against: object removal, most decks (it won't matter much whether you have many allies in the grave or not if the opponent takes out many of your allies anyway).
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