Valravn Summoner

Embody (Sacrifice a creature with lower power or toughness, then return this card from your graveyard
with an undead counter on it. If this card would be put
into the graveyard when an undead counter is on it,
exile it instead)
You may look at and play any cards exiled face
down.
{2}{t}: Exile the top card of target player's library
face down.