in its mana cost, X is considered to be 0.Ugin, the Spirit Dragon is a board reset that can leave a colorless deck remarkably intact. Its minus ability exiles colored permanents with mana value up to the chosen X, allowing artifact and Eldrazi strategies to remove opposing boards while retaining many of their own pieces. Lands usually survive as well because most are colorless.
The distinction is color, not card type. A colored artifact can be exiled, while an ordinary colorless artifact remains. Your own colored permanents are included, so a green ramp deck may lose its mana creatures even while keeping its large colorless finishers. Choosing X carefully can preserve a useful high-cost permanent while clearing smaller threats.
When a reset is unnecessary, the plus ability deals three damage to any target and builds loyalty. It can remove a small creature, pressure another planeswalker, or finish a player. The ultimate supplies life, cards, and up to seven permanent cards from your hand, giving Ugin a strong reason to remain on the battlefield after the initial cleanup. Eight mana asks for a substantial ramp package. Colorless mana rocks and land acceleration fit especially well because many survive the minus ability. Think about the position Ugin leaves behind: removing threats is helpful, but keeping a mana engine and a follow-up threat makes the reset much more decisive. In a mixed-color deck, treat the minus ability as a selective sweeper rather than assuming it will spare your side.
