There's no true "one size fits all" in terms of strategies and ways to play the game
The fact that the effect is harder to stop and exiles is a pretty big deal against some things but again, the seven mana price tag means you probably run Degalmour or Krosan Grip if you really need that kind of security in your answers
You play strong characters, you banish your opponents' characters, and when you don't see any big threats on their side of the board, you start questing
I also like to get the perfect creature for breaking a creature stalemate, like Anger, Glory, Wonder, Genesis, or Filth
The second is that, at two ink, it's one of the cheapest songs in the deck, and an easy way to trigger many of the song-matters characters you'll be playing
Thats a lot of mana for a card that essentially grants you mana with limitations, and for only a couple more mana one can get that without any limitations from blue