As the great scourge passed by, Zendikar shivered, then lay silent.

Sire of Stagnation

Devoid (This card has no color.)
Whenever a land an opponent controls enters, that player exiles the top two cards of their library and you draw two cards.

Modern Horizons 3 Commander

Devoid (This card has no color.)
Whenever a land enters the battlefield under an opponent's control, that player exiles the top two cards of their library and you draw two cards.

Battle for Zendikar Promos

Battle for Zendikar

Devoid (This card has no color.)
Whenever a land enters the battlefield under an opponent's control, that player exiles the top two cards of his or her library and you draw two cards.

A card with devoid is just colorless. It’s not colorless and the colors of mana in its mana cost.

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.

Devoid works in all zones, not just on the battlefield.

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.

If that player has one card in their library when Sire of Stagnation’s triggered ability resolves, that card will be exiled. If their library has zero cards, no cards are exiled. In both cases, you’ll still draw two cards. That player won’t lose the game (until they attempt to draw a card from an empty library).

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.