Luna Noel, the Percipient

You may look at the top card of your library.
{t}, Create a 1/1 blue Elemental creature token
with "Creatures you control get -1/-0:" Prevent
all combat damage that would be dealt to you
this turn.
Return X creatures you own and control to your
hand: Reveal and cast the top card of your library
if its mana cost equals X.