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Boneyard Mycodrax's power and toughness are each equal to the number of other creature cards in your graveyard.
Scavenge {4}{B} ({4}{B}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)
The ability that defines Boneyard Mycodrax’s power and toughness works in all zones, not just on the battlefield.
The number of counters given by Boneyard Mycodrax’s scavenge ability is its power as it last existed in your graveyard before exiling it. Players can’t change how many counters it gives out after you’ve activated the ability by changing what’s in your graveyard.
