Not a bad idea, but Rabadons would have to come after your tank items. Rabadons is a super expensive item, and you couldn't use it that well until you get into the middle of the fight (whereupon you'll blow up if you lack tank). I personally would go voidstaff instead of Rabadons, just to abuse the MPen benefitting his Sunfire as well as all his abilities and natural MR shred.
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Sorc/Merc
Rabadons
Abyssal
Sunfire
Frozen Heart
Warmogs
The percent health damage on w would do a ton as well as hit ult, q and e.
Thoughts?