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While Ive mostly seen it in Tron strategies, you can run it in other similar decks where you want to access card selection at instant speed

These sets are either very strong multicolor sets (Invasion/Planeshift, Khans of Tarkir, Return to Ravnica/Gatecrash, Shadowmoor), sets with great removal at common/uncommon (M11, Conspiracy/Conspiracy: Take the Crown) or strong colorless or colored cards that can reward any draft (Mirrodin/Darksteel and Theros)

You're getting more interaction and more bodies in your deck while using fewer slots

Id expect most blue/black decks to pass on this, with red/black and green/black swinging either way