The nature of the Eldrazi is pretty basic to me. Huge, colorless, nearly unkillable, and game changing. I decided to take a shot at their underlings in contrast to the actual Eldrazi themselves.

Servant of Suffering

Creature - Spirit
(Servant of Suffering is colorless.)Haste, Intimidate.

,

, Sacrifice a Creature: Each player loses life equal to the number of colored permanents they control.
“The pain you cannot witness is the most difficult to avoid.”3/5
This creature is my vision of a member of the brood lineage, the Eldrazi underlings who traverse the world, collecting the energy required to release their masters. This creature specifically is made to weaken those who attempt to make use of the world's colored mana, so that there is a higher abundance of mana to free the Eldrazi.
The way I see it, the Eldrazi and the Brood Lineage are beasts that drift between the Aether and this Realm. They have been stuck in the Aether, and are ready to come down and wreak havok, hence the haste. Why wait to destroy when you have been sealed away for so long? [[Not saying all Eldrazi have haste, some are slower and need to get ready for action]].