Chord of Calling [RVR - 134]

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for 1 or one mana of that creature's color.)
Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle.

Rarity: Rare

#: 134

Card Type: Instant, Instant

Card Color: G

Casting Cost: {X}{G}{G}{G}