A card like Clive, Ifrit's DominantClive, Ifrit's Dominant exiles after paying a cost and then comes back transformed as Ifrit, Warden of InfernoIfrit, Warden of Inferno, and since he's left the battlefield, this means Ifrit will have summoning sickness
A token that's a copy of Enduring Courage won't return to the battlefield when its last ability resolves
Mystical Tutor might be something I would prefer over Merchant Scroll, primarily because you can imprint it with Isochron Scepter and get lots of instants and sorceries
Oh well, he also got big wings out of the deal and can fly now
Marwyn scales naturally with your board, making her one of the best Elf commanders in MTG for explosive combo turns
This card pulls double duty as an amazing enabler for both Wizard and Shaman typal strategies, but in a Wizard-focused deck, Harmonic Prodigy is the engine that makes your entire deck hum