Destroying Phyrexian Avengers 2

Then, suddenly, his strikes became indecisive. A turtle scuttled forward unchallenged and knocked Urza backward; the first time Xantcha had ever seen him touched in battle. He destroyed it with a glut of flame, but not before the other turtles pelted him with bursts of darkness.

After that Xantcha expected Urza to make short work ofthe enemy. Instead he became vaporous, a man of light and shadow.

***

Planeswalker, Chapter 12