As for what the song does, it allows you to remove up to a total of four damage from any number of your characters, and you gain one lore for each point of damage removed using this song
Interestingly, amber is one of the favorite colors for an aggressive playstyle thanks to a number of low-cost characters with high questing potential
Standard is a bit more of a long shot, but you can certainly count on Commander players trying both of these out
If you are capable of healing your cards, through items, actions, or character abilities, and Beast, Tragic Hero has damage on them at the start of your turn, you can let them attack and then heal them, allowing you to still benefit from the increased strength but keeping them healthy enough to stick around
While Yuna doesn't give the card draw that makes these decks run so well, she offers enough other abilities to make her one to consider