Unbound Flourishing 189 (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 - $4.80
LP - $3.80
MP - $2.90
HP - $2.20
DMG - $2.20