Hall of Tagsin [The Brothers' War] Swamp Mountain Forest you may reveal that card

you may reveal that card and put it on top of your library instead of putting it anywhere else

Set: Limited Edition Beta Type: Creature — Demon Rarity: Rare Cost: {4}{B}{B}{B} Flying

Set: Guilds of Ravnica Prerelease Promos Type: Creature — Elemental Rarity: Rare Cost: {1}{R} Whenever you cast a red spell

Set: War of the Spark Promos Type: Legendary Planeswalker — Gideon Rarity: Mythic Cost: {1}{W}{W} As long as it's your turn

Hall of Tagsin [The Brothers' War] Swamp Mountain Forest you may reveal that cardSet: The Brothers' War Type: Land Rarity: Rare {T}: Add {C}. {1}, {T}: Add one mana of any color. {4}, {T}: Create a tapped Powerstone token. (It's an artifact with {T}: Add {C}. This mana can't be spent to cast a nonartifact spell.) The Thran's machines were not dead after all, merely dormant and waiting.