Tidal, Ruler of Waterfalls

You may cast or return Tidal to the battlefield
by exiling 2 blue and/or Dragon cards from your
hand or graveyard.
{t} Pay {u}, Return Tidal to your hand.
You may discard this card and 1 blue Creature to
the Graveyard, then search your library for a
creature card and put that card into your graveyard.
You may exile this card, then search your library
for a blue dragon reveal it and put that card into
your hand.