Varolz and */* creatures
You will get 4 counters.
As in the Possibility Storm question from earlier this week, when an ability moves an object and then refers to the object, it uses the object that existed in the previous zone unless it doesn't make sense. Here it just wants information about the object. Therefore, it will use Boneyard Wurm's power as it last existed in the graveyard, so 4.
Daniel Kitachewsky
L3, Paris, France
Rules NetRep