Nahiri - Controls metal sand

Then the air flashed around her, igniting with a crash as loud as thunder, as Nahiri called the glittering metallic sand of New Phyrexia to join her dance. It rose grain by grain to swirl around her, a storm even deadlier than her hail of shaped stone blades, and crashed together on the fighting figure, overwhelming it as sand invaded exposed machinery and nasal passages alike, putting down Nahiri's opponent in the blink of an eye.

As it fell, Nahiri was there, stepping forward and driving her primary blade home, through the center of the creature. She twisted once, and the shape beneath the mounded sand was still.

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ASSAULT ON NEW PHYREXIA | EPISODE 1: UNCONTROLLED DESCENT