I'd say you could get something close with a warlock/hexblade/swordsage/warmage, with only a level or two of hexblade and fairly even levels of the other three, say 6/2/6/6:
Hexblade for curses
Warlock for at-wills and utility invocations
Swordsage for encounter abilities, specifically Shadow Hand teleports/concealment (Desert Wind ~ infernalock, Diamond Mind ~ starlock)
Warmage for daily abilities, specifically energy-based blasting spells