Well, truth be told, a 750 point battle doesn't leave the Crons with too many options...I'd probably take a Lord w/ Resurrection Orb, twenty Warriors and five Destroyers, then hope for the best.
However, fielding so many Destroyers in such a small/irrelevant battle isn't very fluffy, and I figure more than a little cheap, so alternatively I might drop the Destroyers and the Res Orb in order to take five Scarab Swarms and eight Immortals.