The Eldrazi are back, and they bring their tracking mechanic with them. A spell with devoid simply has no color (though it does still bear a color identity). The mechanic has no gameplay ramifications on its own, though many cards in GQC care about colorless cards. Devoid shows up in blue, red, and green.
When the Eldrazi visit a plane, they spread and grow. Their entire goal as a race is consumption, and propagate represents their wanton proliferation across the plane. When you play a creature with propagate X, you either create X Eldrazi Scions (returning tokens from BFZ, 1/1s that you can sac to add colorless mana) or put X +1/+1 counters on your creature. Ramp early, big creatures late--or, whichever in whichever order you so desire. Like Devoid, Propagate shows up in blue, red, and green.
Jorah's closest confidants in the war against the Eldrazi are those who preach his faith, and those who are born from it. His Clerics spread His good word across the land, and the Angels born from His Holy Word lead the city's flock. In the undercity, a sinister cabal of Demons is born from His Dark Blood, which He harvests from those most worthy and infuses with His own. These profane beasts fuel Ghariv's strongest magics, as well as its darkest secrets. Angels, Clerics, and Demons are reverent. Reverent shows up in white and black.
The Eldrazi are evolving and mutating, seemingly at a whim. Angels and Demons are drawing on arcane power to fight against an unstoppable force. With Coalesce, we see a glimpse of their true strengths, before they finally burst onto the battlefield in a dazzling display. Coalesce shows up in all colors.
Twisting Tendrils takes the long away for Coalesce, as well as for any spell with X in its mana costEDIT: and that's it. That's the whole reason.
Today's update includes GQC's limited archetypes, as well as the first major GQC change! Propagate has changed to create Spawn tokens rather than Scions. Hopefully reducing the power of the Eldrazi tokens will lead to more interesting gameplay decisions with the mechanic.