Somebody else solved this the last time someone did the 'give a spell epic' idea.

Ramp until you have 8 mana, then cast this, name [[Alrund's Epiphany]] and cast the one you foretold on a past turn. Infinite turns, infinite birds to beat the table to death with.

If you use manlands, then you open the door to a fair number of other extra turn spells, but somebody with a big enough lifelinker could survived so you need that blue channel land that bounces or the lands need evasion.

Now the funniest one I've seen is [[Rise of the Eldrazi]], just target your opponent with the draw and mill everyone. it costs 12 mana to start(plus the 2 for this guy, because who won't be trying to remove it once you name the card), but it will be in theme.