Fury acts like a removal spell and a threat at the same time
After your second spell, you get a chance to play whatever's on the top of your library and after your third, Stella can copy an instant or sorcery for you
It's certainly a powerful spell if you have other ways of dealing your opponents mill, or as I like to call it, "deck damage." You can pair this with cards like Deadly Cover-Up and Space-Time Anomaly, assuming you can survive to those turns in the game
This Emerald card prioritizes singing, and rewards you for using your song cards often
Now, gaining two life isnt better than Looting twice, but when your deck is full of Sphinxs Revelations, extra lands are pretty good, so Looting isnt that important
Relic of Progenitus has been one of the premium answers to some strategies: Its cheap, and can play a grindy game removing one card per turn, or one-shot-exiling both graveyards at the right time