Is it that hard to cram 5 Darks into the grave? Once it comes out, it walls everything with its 3000 DEF and is a once per turn Monster Reborn. It has decent attack if you need it for that, but it mostly hangs out in defense and revives stuff. It would require shifting the deck away from Chaos though, but IMO this card has a higher power level than Chaos Sorcerer.
This card cannot be Normal Summoned or Set. This card can only be Special Summoned, by having 5 or more DARK monsters in your Graveyard while you control no monsters. Once per turn, you can remove from play 1 DARK monster in your Graveyard to Special Summon 1 DARK monster from your Graveyard.
If you're not controlling any monsters with this deck you're gonna have a bad time; you always want a BW on the field for/feint Icarus/Kalut
I can see this guy clogging if you're unfortunate to draw it G1
Can't think of any monster I would want to RFG besides Blizzard
edit: I guess if you manage to get this guy on field you can fodder of the stuff for Icarus