+2: Ugin, the Spirit Dragon deals 3 damage to any target.
−X: Exile each permanent with converted mana cost X or less that's one or more colors.
−10: You gain 7 life, draw seven cards, then put up to seven permanent cards from your hand onto the battlefield.
Quote from Zetastrophenow »He doesn't strike lands, so don't worry. His minus only affect permanents that have a color and lands are colorless unless they are made into colored creatures by some effect. And there are a lot of those...