For a common Aura, especially one that was printed so many years ago, Crown of Flames is a decent card. But does it still see any play anywhere? Actually, some Anax and Cymede EDH decks play a copy. This is mostly because Anax and Cymede decks play a lot of Heroic creatures. Because Auras target the creature they are Enchanting, they trigger Heroic abilities. So it’s a pretty efficient card in that deck, since you can get it back to your hand and then target another creature.
Some Shu Yun, the Silent Tempest EDH decks have been seen to play Crown of Flames, too. Although Auras are certainly useful to Shu Yun, it’s not an optimal card choice for his deck.
Have you ever played with Crown of Flames? It’s a decent little common, even if its playability today is fairly limited to a few EDH decks.