Urza - Explodes Phyrexian wells

Urza rose from the dirt where his feet had alighted for a moment. He floated straight into the air and unleashed red bolts down the ring of wells in the main courtyard. The blasts of energy sailed down the throats of the channels. They flashed past the shadowy forms that scuttled upward. At the waterline, a sudden inferno erupted. Red water and black-charred bodies geysered from the wells. The ground around each well head mounded up in swollen distress. In the next moment, rock and mortar and dirt cascaded down into fire-fused plugs. The wells were closed. The Phyrexians below would drown.

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Time Streams, Chapter 17