Brain in a Jar [Shadows over Innistrad Prerelease Promos]Set: Shadows over Innistrad Prerelease Promos Type: Artifact Rarity: Rare Cost: {2} {1}, {T}: Put a charge counter on Brain in a Jar, then you may cast an instant or sorcery spell with mana value equal to the number of charge counters on Brain in a Jar from your hand without paying its mana cost. {3}, {T}, Remove X charge counters from Brain in a Jar: Scry X.