Archmage Mentor

{2}{u}: Potential 2 (If this creature hasn't reached its potential, put a +1/+1 counter on it. When the second +1/+1 counter is placed on this creature, it reaches its potential.)
Whenever a creature you control reaches its potential, you may draw a card.
Shaken by the devastation unleashed by the Awoken and its nightmares, the Vazdurek began to train any who would join in ancient wizardry.