^Fifth

It's a Difth Dawn common. The rule in pauper is if it was printed as a common it's good. I'd hang on to he Zeniths, they'll hold value in Modern so it nothing else they're good trades

It looks like Spark Elemental breaks the Pauper restriction - are you no longer trying to meet that format?

If not, I've got a playset of Red Sun's Zenith you might be interested in, instead of Disintegrate, now that they've rotated out.

V2. New sideboard, more instants more damage to player or creature and new creatures. 

Draft one. Minus the sideboard, and the fact that deckbox thinks the land is worth 1.22 each it's also right around $20.