Creature — Wurm */*, 1G (2)
Uncommon
Boneyard Wurm's power and toughness are each equal to the number of creature cards in your graveyard.
The only thing it likes more than discovering a pit of bones is adding to it.
Illus. Jaime Jones

9/22/2011: The ability that defines Boneyard Wurm's power and toughness works in all zones, not just the battlefield. If Boneyard Wurm is in your graveyard, it will count itself.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Extended (Type 1.X)
Legal in Standard (Type 2)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern