"Some Eldrazi, their purpose is obvious: suck the life out of the land, birth new Eldrazi. Others aren't so obvious, and those are the ones that make me really nervous."
—Chadir the Navigator
Herald of Kozilek's last ability can't reduce the amount of colored mana you pay for a spell. It reduces only the generic component of that mana cost.
2015-08-25 · Wizards of the Coast
If there are additional costs to cast a spell, or if the cost to cast a spell is increased by an effect, apply those increases before applying cost reductions.
2015-08-25 · Wizards of the Coast
Cards with devoid use frames that are variations of the transparent frame traditionally used for Eldrazi. The top part of the card features some color over a background based on the texture of the hedrons that once imprisoned the Eldrazi. This coloration is intended to aid deckbuilding and game play.
2015-08-25 · Wizards of the Coast
Other cards and abilities can give a card with devoid color. If that happens, it's just the new color, not that color and colorless.
2015-08-25 · Wizards of the Coast
If a card loses devoid, it will still be colorless. This is because effects that change an object's color (like the one created by devoid) are considered before the object loses devoid.
2015-08-25 · Wizards of the Coast
The cost reduction can apply to alternative costs.
2015-08-25 · Wizards of the Coast
If a colorless spell you cast has {X} in its mana cost, you choose the value of X before calculating the spell's total cost. For example, if that spell's mana cost is {X}, you could choose 5 as the value of X and pay {4} to cast the spell.
2015-08-25 · Wizards of the Coast
A card with devoid is just colorless. It's not colorless and the colors of mana in its mana cost.
2015-08-25 · Wizards of the Coast
Devoid works in all zones, not just on the battlefield.
2015-08-25 · Wizards of the Coast
Herald of Kozilek's last ability doesn't change the mana cost or mana value of any spell. It changes only the total cost you actually pay.
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