Unbound Flourishing is a mythic Enchantment card from Modern Horizons (MH1), collector number 189. Current market price: $2.91 (foil $22.92), TCGplayer market prices via Scryfall.
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.