Azuria, the Mind's Eye

Flying
Whenever Azuria, the Mind's Eye deals combat damage to a player you may pay {2}{u}. If you do, target opponent puts the top six cards of their library into their graveyard. Draw two cards on your next upkeep.
{6}{w}{u}{b}: Draw five cards and take an extra turn after this one. Sacrifice Azuria, the Mind's Eye after this ability resolves.