2/11/2013 - Inspired loosely by Frontline Medic, which seemed to beg the question "What else can we do with X spells?", I present Rewire.
Rewire is a bad Mana Leak for your opponent's Bonfire of the Damned, or a bad Dark Ritual for your own, and yet I feel like that's a great place for red's metamagic.
I shudder to imagine the set where Rewire is common; this should definitely be uncommon if not rare.
Notice how cycling is a bit of a cop-out?
Designer: "Here's a clever effect!"
Designer's Conscience: "It will only be relevant, like, 5% of the time. Tops!"
Designer: "...Give it cycling?"
Designer's Conscience: <facepalm>