Osaza, Regent of Legality

Flying, hexproof
{w}{w}{u}{u}, {t}: Tap or untap a number of
creatures equal to your devotion to white and
blue.
Whenever Osaza, Regent of Legality becomes
tapped you may pay {x}. If you do, you may draw
up to X cards. X cannot be greater than your
devotion to white and blue.