If however the spell you manage to place back on top is one that is only useful because of the stage of the game such as a ramp spell then you have gained a huge advantage, greater that you would have gotten from putting that card in the graveyard
SEC (Secret Rare) The stop breathing pulls

Mono-Green Fight The Unbeatable Squirrel Girl 1.0%inclusion 1 decks 97 decks M'Baku, Jabari Chieftain 1.2%inclusion 1 decks 83 decks Top Commanders Legolas, Master Archer 23%inclusion 175 decks 771 decks Strong, the Brutish Thespian 12%inclusion 92 decks 771 decks Ayula, Queen Among Bears 12%inclusion 92 decks 771 decks Gargos, Vicious Watcher 11%inclusion 88 decks 771 decks Rhonas the Indomitable 7.4%inclusion 57 decks 771 decks Grothama, All-Devouring 6.7%inclusion 52 decks 771 decks Sekki, Seasons' Guide 4.4%inclusion 34 decks 771 decks The Tarrasque 2.9%inclusion 22 decks 771 decks Ghalta, Primal Hunger 2.9%inclusion 22 decks 771 decks Fynn, the Fangbearer 2.5%inclusion 19 decks 771 decks Iwamori of the Open Fist 1.4%inclusion 11 decks 771 decks Kogla, the Titan Ape 1.0%inclusion 8 decks 771 decks Kamahl, Fist of Krosa 0.6%inclusion 5 decks 771 decks Questing Beast 0.6%inclusion 5 decks 771 decks Wilson, Refined Grizzly // Raised by Giants 0.5%inclusion 4 decks 771 decks Vorinclex 0.5%inclusion 4 decks 771 decks Thrun, Breaker of Silence 0.5%inclusion 4 decks 771 decks Tifa Lockhart 1.0%inclusion 4 decks 383 decks Kona, Rescue Beastie 0.6%inclusion 4 decks 690 decks Selvala, Heart of the Wilds 0.4%inclusion 3 decks 771 decks Nylea, God of the Hunt 0.4%inclusion 3 decks 771 decks Goreclaw, Terror of Qal Sisma 0.4%inclusion 3 decks 771 decks Lumra, Bellow of the Woods 0.4%inclusion 3 decks 771 decks Yorvo, Lord of Garenbrig 0.4%inclusion 3 decks 771 decks New Cards Beorn the Fierce 33%inclusion 32%synergy 2 decks 6 decks Epic Fight 7.8%inclusion 6%synergy 7 decks 90 decks Fight for the Throne 4.8%inclusion 4%synergy 4 decks 83 decks It's Clobberin' Time

Thanks for reading, and in the meantime, keep getting into your opponents minds and libraries with horrors
Unlimited cards changed this with a gray shadow effect and bolder text
Its understandable, given just how hard it can be to really understand opportunity cost and to fully appreciate the selection Brainstorm gives us access to, but the technology of cost-efficient cards that shuffle pushed it over the edge