This elemental wizard is a 4/4 creature for a whopping 10 mana, but it costs two less for each different mana value among instant and sorcery cards in your graveyard
Mark Rosewater digs into these categories in detail in his article "The Midas Touch." "Chinese Menu" Designs These cards take an effect that would be appropriate for Color A and one that would be appropriate for Color B and crudely glue them together onto one card
One neat trick to remember about is that you can cast it to destroy an Urzas Saga with its first lore counter trigger on the stack, which means your opponent would not get the chance to tap the land for mana
While she is able to sing anything with a cost of six or lower, her true power isn't when she sings at all
The devotion mechanic is really strong in black with payoffs like Gray Merchant of Asphodel and enablers like Phyrexian Obliterator, Ayara, First of Locthwain, and Doomsday Excruciator, just to cite a few