This card also synergizes well with the noncreature spell strategy, since it will let you fix your draws each time you cast one
Rather than writing everything out, using multipliers, and doing all of the stuff we do for the article, you can simply add up the total value of all the mythics in the set (in this case, roughly $115), divide by the total number of mythics in the set (generally 15 but sometimes slightly different Throne of Eldraine has 15, which would give us $115.05 / 15 = $7.67) to get the average value of a mythic rare, and then finally multiply by the number of mythics you'll get from an average box (here's a cheat sheet: the average box as 4.5 mythics, 31.5 rares, 108 uncommons, and 360 commons)
Use the mana value of the creature as it last existed on the battlefield to determine the value of X
Birds of Paradise has fallen out of favor in Constructed due to the power of other mana dorks such as Delighted Halfling and Ignoble Hierarch, but its a slam dunk in multicolor Commander decks at the very least