Bloodlust / Heroism

Bloodlust-style haste is the biggest throughput buff a five-player key can get. It is usually used on the hardest boss or the largest trash pull, so every serious comp wants exactly one provider.

Specs that bring bloodlust / heroism

Preservation Evoker
Fury of the Aspects
Restoration Shaman
Heroism
Survival Hunter
Primal Rage
Enhancement Shaman
Heroism
Augmentation Evoker
Fury of the Aspects
Devastation Evoker
Fury of the Aspects
Beast Mastery Hunter
Primal Rage
Marksmanship Hunter
Primal Rage
Arcane Mage
Time Warp
Fire Mage
Time Warp
Frost Mage
Time Warp
Elemental Shaman
Heroism