Elsewhere...Jonas tosses and turns, sweat breaking out on his brow. In his dreams, he is running. Not for fun, or even in hurry, but for his very life. He cannot remember
why he runs, why he doesn't turn and fight, but the certainty grips him that if he were to stop, even to pause he would be run down mercilessly.
Behind him, a horse-like creature canters easily. It's ribs are sunken, it's coat flows with ashen grey, and shadow clings to it's hooves and flows in smokey tendrils from nostrils. It could easily catch up, but it seems to be playing with the Troll, like a cat with a mouse.
Onward, the Nightmare chases Jonas, until he finally, blessedly, awakes.
https://assets.echomtg.com/magic/cards/cropped/61519.hq.jpg