Destroying Phyrexian Avengers

The Yotians had been utterly destroyed without bringing down a single Phyrexian, which meant that Urza had to face them all. He had the skill and power, though the turtles were a bit tougher, a bit nastier they'd been in the last ambush, as if Phyrexia were learning from its failures-a frightening notion in and of itself.

There were only eight of the avengers left. Urza had destroyed two of those with dazzling streaks of raw power from his jeweled eyes. No one learned faster than Urza. He never tired nor depleted his resources. So long as there was substance beneath his feet or stars in the sky overhead, Urza the Artificer could work his uniquely potent magic.

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Planeswalker, Chapter 12