In the collectible card game Magic: The Gathering (MTG), mana rocks are a type of artifact that can be tapped to produce mana, the resource used to cast spells. They are often used in decks that need to ramp up their mana production quickly, or that want to have access to mana of multiple colors.
Mana rocks can be very powerful, as they can allow players to cast spells earlier than they would otherwise be able to. However, they can also be vulnerable to removal spells, so it is important to protect them if possible. Some of the most popular mana rocks include Sol Ring, Arcane Signet, and Talisman of Dominance.