Dark Dreams

Target opponent loses 3 life, discards a card, and sacrifices a nonland permanent.
The great bulk of the thing came clear against the sky
as it stood for along moment poised on the valley's
edge. It was a wheel, a huge black wheel as tall as a
tower. Sunk into the twilight of its shadow, Simon
could only gape as it began to turn with excruciating deliberateness, to slowly roll down the long green slope, spouting flayed gouges of sod behind it.