Rulings

• 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
• 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
• You choose which creature you control to sacrifice as the first triggered ability resolves. Players can respond to this ability triggering, but once you choose a creature to sacrifice, it's too late for anyone to respond.2015-08-25
• Devoid works in all zones, not just on the battlefield.2015-08-25
• Sacrificing Smothering Abomination will cause its last ability to trigger.2015-08-25
• 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
• If Smothering Abomination is the only creature you control as its first triggered ability resolves, you must sacrifice it.2015-08-25
• A card with devoid is just colorless. It's not colorless and the colors of mana in its mana cost.2015-08-25