Heart of the Mountain - Arcane Signet Price

Updated 2026-08-21

Heart of the Mountain is the Secret Lair promo treatment of Arcane Signet, one of the most-played mana rocks in Commander. Arcane Signet appears in a substantial share of decks across the format, giving it structural demand that persists regardless of metagame shifts. This promo version pairs that staple utility with an elevated art treatment, drawing collector interest from players who already own functional copies and simply want the best-looking version in their deck. Supply is fixed at whatever entered the market through the original drop window, and no new copies will ever be added. No price change data is currently available for this listing, making realized auction history and recent sales the most useful tools for tracking where it actually trades. The card sits at the intersection of playability and art collectibility, a position that tends to keep a floor under secondary market pricing even during slow periods for Commander singles broadly.