Luke Skywalker, Farmboy

Vigilance
{t}: Add {g}, {w}, or {u} to your mana pool. Put a +1/+1 counter on Luke Skywalker.
At the beginning of your upkeep, if there are three or more +1/+1 counters on Luke Skywalker, transform Luke Skywalker.
I want to learn the ways of the force...