Bestow {2}{B}{B} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached.)
This creature and enchanted creature each get +X/+X, where X is the number of creature cards in all graveyards.
Nighthowler has 6 listed printings; the most valuable is the Game Day printing from PTHS at US$6.90 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.
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