Color vs Color Identity
Now with two runs of Zendikar vs Eldrazi beta under our belts, I think it's a good time to bring this up again.
Please adjust the way cards with devoid are addressed by the game. Devoid creatures are meant to be considered colorless despite having colored mana requirements to cast them. The mechanic really needs to be addressed in order to be cohesive and have synergy for the eldrazi of that block. So here's what I believe we need to have addressed:
Have the game consider creatures with devoid to be colorless while retaining the color bars underneath restricting which eldrazi can appear together in which decks. Right now the eldrazi lack cohesion with themselves because cards meant to support the tribe currently actively do not do so.
Examples of this include:
Herald of Kozilek
Additionally many eldrazi that have colors aren't considered devoid, and don't gain any mana from devoid gems on the field. This should be added to those cards, as well as cards that don't have a color, but did have colorless casting requirements should also charge from devoid gems (also can we get them to get more bonus than 3 mana?)
Examples of cards that could have the devoid mechanic are:
Walker of the Wastes