Natures Rhythm 150 (Tarkir: Dragonstorm)

Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle. Harmonize {X}{G}{G}{G}{G} (You may cast this card from your graveyard for its harmonize cost. You may tap a creature you control to reduce that cost by an amount of generic mana equal to its power. Then exile this spell.)

NM - $9.60
LP - $7.70
MP - $5.80
HP - $3.90
DMG - $2.00