| 8/25/2015 |
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. |
| 8/25/2015 |
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. |
| 8/25/2015 |
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. |
| 8/25/2015 |
The cost reduction can apply to alternative costs. |
| 8/25/2015 |
If a colorless spell you cast has  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 , you could choose 5 as the value of X and pay  to cast the spell. |
| 8/25/2015 |
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. |
| 8/25/2015 |
A card with devoid is just colorless. It's not colorless and the colors of mana in its mana cost. |
| 8/25/2015 |
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. |
| 8/25/2015 |
Devoid works in all zones, not just on the battlefield. |
| 8/25/2015 |
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. |
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