Crosis's Attendant.

Not really. Snapcaster is probably overall better, but this card allows you to reuse two cards instead of one. Instead of an extra use, snapcaster gives you a 2/1, flash, and the ability to use instants out of the graveyard.

Only problem is that if you flashback Surreal Memoir, you don't get the rebound. Rebound only works when you cast it from your hand (otherwise it would rebound forever lol).

It seems like it's extremely narrow, and it's definitely more narrow than other cards that give flash back to anything (snapcaster mage), but sorceries are literally half of the different types of cards that can even have flashback.