Just checked, it's 5. And yeah, raid buffing pre something like hosh or nex is fantastic. Gives you that buffer (especially hosh) to start heroic bonding early. Can do about 4 heroic bonds until people start getting into the danger zone (Laanaaaaaa) and need to WoR. Usually at that point you won't die from the first WoR and may have the mana to pop a second WoR. Then, soulfire/reaper if needbe, but fights haven't been lasting that long. Have had a 3/5 soulfire for like a month now.