Eldritch Evolution 5/50 (Secret Lair Showdown)

As an additional cost to cast this spell, sacrifice a creature. Search your library for a creature card with mana value X or less, where X is 2 plus the sacrificed creature's mana value. Put that card onto the battlefield, then shuffle. Exile Eldritch Evolution.

NM - $21.80
LP - $17.50
MP - $13.10