The Mind Stone is a mythic Legendary Artifact — Infinity Stone card from Marvel Super Heroes (MSH), collector number 21. Current market price: $45.19 (foil $84.84), TCGplayer market prices via Scryfall.
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.