Ob Nixilis - Drains vitality out of stone

The walls of that passage lurched, and crushed stone rained down on the demon's back. The sides of the passage suddenly crushed together. The depths of Zendikar had detected an intruder, and the stone itself sought to purge him. He bought himself a moment by bracing himself between the walls, and he muttered a spell. The vitality of the stone was drained away, the animating force snuffed out, and the rock crumbled in a perfect sphere around the demon's crouching form. Through tiny cracks, the green glow beckoned him on. He began to dig.

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DREAMS OF THE DAMNED