Will of the Cube

All colorless costs must be paid with {c}, {u}, or {b}.
"At first we thought it was Old World Tech, but soon realized it appeared only recently. It responds to power sources both close to it and far way. From all relevant testing we can surmise it notices us and is here because of us, but testing has not determined if that is a good thing."
— Erimor Le Roux, Arcanist