Imprisoned in the Moon (Borderless) [Secret Lair Drop Series] SM103a Set: The List Type: Land

Set: The List Type: Land Rarity: Rare Sea of Clouds enters the battlefield tapped unless you have two or more opponents

the Molten Pinnacle deal 3 damage to any target

but I believe a more mundane power source might suffice

Whenever a Mountain enters the battlefield under your control

Set: Unknown Event Type: Instant Rarity: Common Cost: {1}{G}{G} Target opponent gets a poison counter

Imprisoned in the Moon (Borderless) [Secret Lair Drop Series] SM103a Set: The List Type: LandSet: Secret Lair Drop Series Type: Enchantment Aura Rarity: Rare Cost: {2}{U} Enchant creature, land, or planeswalker Enchanted permanent is a colorless land with {T}: Add {C} and loses all other card types and abilities. An unlikely jail for an impossible inmate.