Cards you might have discarded with Jace, Vryns Prodigys draw and discards effect, or maybe a removal spell you cast on a bothersome early creature coming back to take out a mid-game threat
This is also valuable in token decks, as generating a lot of 1/1 or 2/2 tokens would reliably trigger Enduring Innocent's card draw.
Most of the more expensive tutors have two things in common: theyre either extremely efficient, or they can fetch a broad swathe of cards
All that being said, this is probably an awesome out-of-the-box experience, but the abysmal reprint value and parasitic components make this a poor purchase for fleshing out your collection
Logically, the only thing more efficient than cheap spells is playing spells for free
Cards like Rapunzel, Gifted with Healing, let you draw and heal, while Elsa, Spirit of Winter, can freeze opposing characters, buying you time to quest safely