Sire of Stagnation

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).

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.