Isle Lord's Aide

Whenever you cast a blue spell, you may pay {2}, if you do, put {e} on Isle Lord's Aide.
When Isle Lord's Aide enters the battlefield, put {e}{e} on Isle Lord's Aide.
Hexproof
Pay {e}, {t}: tap target creature.
Pay {e}{e}{e}, {t}: add {u}{u} to your mana pool
Pay {e}{e}{e}{e}{e}{e}{e}{e}{e}{e}, {t}: take an extra turn after this one.
All wizard creatures you control have vigilance.