Eldrazi Gravelord

Deathtouch, Devoid(This creature is colorless)

At the beginning of your upkeep, put a 1/1 colorless Eldrazi creature token with "Sacrifice this creature, add {c} to your mana pool" onto the battlefield.
You may cast creatures from any graveyard. You may spend mana as though it was any color to cast creatures this way. Use only mana produced by creatures to cast creatures this way.