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As Ashen Rider comes into play you get to exile any permanent of your choice, and then do it again when it dies

He was drawn by the potency of the leylines, the invisible bands of energy running deep beneath Ravnica's heights

For example, you might believe that 3 damage is a little on the weak end in this format, since so many things make tokens and what you often have to worry about are larger creatures

Then, anytime you cast another colorless spell with Ugin in play, you'll exile another permanent that is one or more colors

If the card has mandatory additional costs (such as Fling does), you must pay those when you cast the card.