Mountain (215) [Unstable]Set: Unstable Type: Basic Land Mountain Rarity: Common ({T}: Add {R}.)

Set: Fallen Empires Type: Instant Rarity: Common Cost: {U} Until end of turn

Players can't play nonbasic lands with the same name as a nontoken permanent

If they guess wrong

Set: League & Championship Cards Type: Special Rainbow Energy Rarity: Promo

Set: HeartGold & SoulSilver: Base Set Type: Grass Rarity: Uncommon Retreat cost: 0

Set: Team Rocket 1st Edition Type: Lightning Rarity: Holo Rare Retreat cost: Colorless

Set: XY: Ancient Origins Type: Water Rarity: Holo Rare Retreat cost: Colorless

Set: Magic 2012 Type: Sorcery Rarity: Uncommon Cost: {2}{B}{B} Search your library for a card

Set: New Phyrexia Type: Artifact Creature — Phyrexian Insect Rarity: Rare Cost: {1} {X}{B/P}: Remove up to X counters from target permanent

Set: Team Rocket 1st Edition Type: Trainer Rarity: Common

Set: Box Topper Type: Metal Rarity: Promo Retreat cost: Colorless

Set: Theros Type: Land Rarity: Rare Temple of Mystery enters the battlefield tapped