We were missing a mana sink and graveyard mechanic, and, well flashback certainly fit the bill
So much so that stores often had stock issues: everyone wanted Set Boosters rather than Draft Boosters
Traditionally, Elsa alts have done very well in value to say the least, and that combined with this cards really cool effect should make this one of the more bankable Enchanted song cards of them all
They are very good cards, but it leaves the color struggling some for the core creature support aggressive decks need
On top of that, Aurora, Dreaming Guardians three strength and five willpower pair with its two lore to make it a solid card by itself, able to likely withstand a few attacks in the early game - especially given that having Shift 3, allowing you to bring it out on top of another Aurora card for a lower ink cost, means you can have it on the field very early on
I think the most busted thing about playing this deck is how often you can simply ignore the early game and chain ramp spells together on curve very few opponents will be able to apply enough pressure before you hit that six-plus mana threshold and start chaining bombs