Ugin's Construct #164

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When this creature enters, sacrifice a permanent that's one or more colors.

“While trapping the Eldrazi on Zendikar, Ugin learned little from Sorin, but he gleaned the rudiments of lithomancy from Nahiri.”

4/5

Rulings (1)

Nov 24, 2014

If you control only colorless permanents as the ability resolves (for example, basic lands and face-down permanents), you won't sacrifice anything.