Kaladesh Inventions Sphere of Resistance Artifact Spells cost more to cast.
"At the outset, we weren't aware of Chief Baral's motives for the project. It's now apparent that he intends to use the device to hamper the 'mages' among the ranks of the renegades."Consulate engineer's log Illustrated by Richard Wright All Magic: The Gathering (MTG) card images and symbols Wizards of the Coast