Etherium Tether

“That etherium tether,” he said, “is an interesting workaround. Is that yours?”

She shrugged. “It lets me activate his Spark, kinda like secondhand. He’s out because—well, you’d be the one to know. Awake through a planeswalk? Your gadget would probably kill him.”

“It was designed to. My compliments on your solution.”

Test of Metal: A Planeswalker Novel (Magic The Gathering: Planeswalker Book 3), Chapter 6