Hunnin, Darkwood Prophet

When Huninn, Darkwood Prophet enters the
battlefield, surveil 4. (To surveil 4, look at the
top two cards of your library, then put any number
of them into your graveyard and the rest on top of
your library in any order.)
{g/u},{t}, Sacrifice a nontoken creature : Surveil 2.
Pay 6 life: Return Huninn, Darkwood Prophet to
the battlefield.