The Mind Stone is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Indestructible : Add . , : 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.

Complete guide

The Mind Stone is a legendary artifact that offers both reliable mana acceleration and late-game utility through its unique Harness mechanic. Once empowered, it transforms into a repeatable engine for protecting your permanents and triggering enter-the-battlefield abilities. This Infinity Stone is particularly potent in decks that value resilience and tactical re-positioning.

What it Does

The Mind Stone serves two primary purposes: it is an indestructible mana rock that provides white mana and a powerful flickering tool. Being Indestructible means most removal spells that say 'destroy' will fail to remove it from the board. Its Harness ability requires a one-time payment of six mana to unlock its 'Infinity' (∞) trigger, which remains active for the rest of the game as long as the Stone is on the battlefield.

How it Resolves Step by Step

First, you cast The Mind Stone for two mana. Once it is on the battlefield, you can tap it for white mana immediately if it is your turn and it doesn't have summoning sickness (though as a non-creature artifact, it can tap immediately). To Harness it, you must pay five generic and one white mana and tap the artifact. Once that ability resolves, the Stone becomes 'harnessed'. From then on, at the beginning of each of your end steps, you choose up to one other target nonland permanent you control to exile and immediately return to the battlefield.

Common Mistakes

A common mistake is trying to target The Mind Stone itself with its own Infinity ability; the text specifically says 'other target nonland permanent,' so it cannot flicker itself. Additionally, players often forget that the Harness ability is an activated ability that requires tapping the artifact, meaning you cannot use it for mana and harness it in the same turn without a way to untap it. Finally, remember that the harnessed status is tied to that specific permanent; if it leaves the battlefield and returns, it will no longer be harnessed.

When to Play It

You should play The Mind Stone early if you need the mana ramp, as its Indestructible keyword makes it a very safe investment. Hold onto your mana to activate the Harness ability when you have permanents with powerful 'enters the battlefield' effects or when you need to remove negative counters or Auras from your own permanents.

Interaction examples

Accelerating the Harness

Sol Ring

With Sol Ring on the battlefield, you can use its two colorless mana to help pay for the Harness cost of The Mind Stone. This allows you to unlock the Infinity ability much earlier in the game than if you relied on land drops alone, enabling your end-step flicker effect by turn four or five.

Color Fixing for the Stone

Arcane Signet

If you are playing a multi-color deck, Arcane Signet ensures you have access to the specific white mana required to activate the Harness ability of The Mind Stone. Once harnessed, you can use the Stone to flicker the Arcane Signet itself if you need to reset it for any reason, though usually you will target creatures with impactful abilities.

Protecting Assets

Even without other cards, The Mind Stone provides a 'flicker' loop. At your end step, you can target a creature you control that was targeted by an opponent's spell that turn (if the spell hasn't resolved) or simply to refresh a creature that attacked, as it returns to the battlefield untapped and as a new object.

Guide written with AI from the official text and rulings. Official English text prevails.