You need a paladin. First off do the following:
1. Make sure all your paladin's have Divine Intervention up and have symbols of Divinity.
2. Make sure your Priests and Druids and MT are Soulstoned. If you are really determined, you can SS your entire raid by having a small army of alt Warlocks camped outside the BWL entance. (lvl 18 I think gets you the 15 minute SS with very minimal life return. Just pop potions and use bandages to heal and mana up)
You want to wait until about 1/3 through the first part of the encounter (when you are trying to break eggs by Mindcontrolling Razorgore and the orcs and Dragons are runnign beserk. Mainly because I think you need to fill the room to it's max occupancy. Kite the orcs and sleep the dragons until you are ready to perform the exploit.
Now here is what you do.
1. MC Razorgore with the Orb.
2. In unison have each paladin DI one person. Now the most important person to DI is Razorgore himself. Since he is green and friendly while MC'd, you can DI him.
Razorgore needs to be the last person DI'd.
3. Everyone in the raid now needs to die. Stop healing, let the dragons and orcs wipe you out as fast as possible.
4. Once the raid is no longer agroed, due to being dead and/or DI'd, Razor's script will caus ehim to kill all the orcs and dragons, yet he will remain DI'd and not die as per usual.
5. As soon as this happens you must cancel DI and use your SS's and start rezzing people. You will need at least 10 people to kill Razorgore. At this point he is now easy. Remember you have to do all this in 30 seconds because when DI wears out he starts killing people. The most important things to have up are:
Main Tank
2 Priests
6 Damage dealers
2 Paladins for fire resistance.
Razor is basically a big version of Drakk from UBRS and is not too much harder once you bypass the first part of the encounter.
Hopefully I have the full sequence of events. For more reference see this thread on main WoW boards:
When I saw it being done, it took 6 minutes to defeat the encounter.