Xollen Drisk, Adventurer

{w}: Put a double strike counter on Xollen Drisk
and it becomes a Human Mutant Warrior with
base power and toughness 3/3.
{w}{r}: If Xollen Drisk is a Warrior, put a vigilance counter on it and it becomes a Human Mutant
Knight with power and toughness 4/4.
{1}{w}{r}: If Xollen Drisk is a Knight, put a flying counter on it and it becomes a Human Mutant
Knight Avatar with power and toughness 6/6.