Neth, Soul Whisperer

+1: You get an Emblem with: "When a creature goes into the graveyard or exile zone, you may pay {b}{u}. If you do, target creature gets +2/+2.
-X: Sacrifice X creatures: you gain life equal to twice X.
-7: Search your library for any number of creature cards, then exile them. All opponents take damage equal to twice the amount of creatures exiled.