Raven Egg

As Raven Egg enters the battlefield put a Fledgling counter on it
During your upkeep remove a Fledgling counter from Raven Egg
if there are no Fledgling counters on Raven Egg, Sacrifice it, search your library for a Bird Creature, put it on the battlefield and give it haste until the end of the turn

"A nascent Raven. It is no less conniving in its incubation."