Phyrexian Portal would be nice...
My collection is lacking.
Icy Manipulator. Can you imagine if this thing was printed in MM Block? It would certainly be a power card, but not too broken, as it's not really a Port due to the high casting cost... And no, Ring of Gix is NOT a replacement for Icy. I want the real thing!
How about a reprint of everyone's favorite annoying artifact: Static Orb.