Elvish Archdruid and Master Biomancer
                
                    
                    
                    Elvish Archdruid will enter the battlefield with 2 counters.
Replacement effects are normally processed entirely based on the situation before the event would happen (because you need to know what the event is before carrying it out), modified by other replacement effects which already affect this event.
For the “enter the battlefield” event, we also consider:
- static abilities of the permanent, if those affect the permanent itself, but not if they affect a group of permanents (i.e. Diregraf Ghoul enters the battlefield tapped because it talks about itself, Orb of Dreams enters untapped because it affect a group)
- continuous effects that modified that permanent on the stack (if you control Bramblewood Paragon, cast a Runeclaw Bear, and cast Artificial Evolution on the Bear on the stack changing Bear to Warrior, it will enter the battlefield with a +1/+1 counter)
Notice that we never consider how the would-be permanent affects anything on the battlefield. We are still before it enters the battlefield when we look at the permanent. In our situation, Master Biomancer is a 2/2 at this time and so Elvish Archdruid will enter the battlefield with two counters.
Daniel Kitachewsky
L3, Paris, France
Rules Netrep