The Mind Stone{1}{W}

Legendary Artifact — Infinity Stone

Indestructible {T}: Add {W}. {5}{W}, {T}: Harness The Mind Stone. (Once harnessed, its ∞ ability is active.) ∞ — At the beginning of your end step, exile up to one other target nonland permanent you control, then return that card to the battlefield under its owner's control.