Catkin Squire

{w}: Catkin Squire becomes a Cat Knight with base power and toughness 2/2.

{1}{w}: If Catkin Squire is a Knight, put a double strike counter on it and it becomes a Phyrexian Cat Knight with base power and toughness 3/3.

{1}{w}{w}: If Catkin Squire is a Phyrexian, put a +1/+1 counter on it, and you gain 1 life.