Gallius, Harbinger of Tides

When Gallius, Harbinger of Tides enters the
battlefield, reveal the top 5 cards of your
library. You may put a blue permanent card
from among them onto the battlefield. Put
the rest into your graveyard. When Gallius,
Harbinger of Tides dies, you may return
another target blue permanent card from
your graveyard to the battlefield.