Unbound Flourishing (Modern Horizons)

Whenever you cast a permanent spell with a mana cost that contains {X}, double the value of X. Whenever you cast an instant or sorcery spell or activate an ability, if that spell's mana cost or that ability's activation cost contains {X}, copy that spell or ability. You may choose new targets for the copy.

NM - $16.00
LP - $13.00
MP - $9.50
HP - $6.50
DMG - $3.50