It's a Reprocess on a stick that's on curve and evasive
How good it is in EDH both as a commander and inclusion in the 99 makes it an obvious pick, right
Black Lotus, the Power Nine, original dual lands, Lightning Bolt, Sol Ring, Birds of Paradise, Demonic Tutor, and other famous cards have recognition beyond normal gameplay
Cinderella Stouthearted acts as a durable body that requires a tonne of resources to answer, shell need to be if shes paired with Anna True-hearted who allows her to quest for an insane 4 Lore
If most of your creatures are 1-drops and 2-drops, as is the case in many decks like Delver, wheres the restriction
When you had a narrower range of cards and more utility dorks with specific purposes in your deck an ongoing tutor effect like this was great