Master Biomancer

Oracle Text

Each other creature you control enters the battlefield with a number of additional +1/+1 counters on it equal to Master Biomancer's power and as a Mutant in addition to its other types.

Card Rulings

1/24/2013 To determine how many additional +1/+1 counters a creature enters the battlefield with, use Master Biomancer’s power as that creature is entering the battlefield.