Corlina, Adazar Librarian

Flying
Flicker (At the beginning of your end step, exile this creature. Return it to the battlefield under its owner's control at the beginning of the next upkeep.)
When Corlina, Adazar Librarian enters the battlefield, you get a page counter.
When Corlina, Adazar Librarian leaves the battlefield, draw a card for each page counter
you have.