Steam Vents [Guildpact] Aether Revolt then sacrifice it unless you

then sacrifice it unless you pay its upkeep cost for each age counter on it

remove all mire counters from a land that a mire counter was put onto with Cyclopean Tomb but that a mire counter has not been removed from with Cyclopean Tomb

Set: Battle for Zendikar Prerelease Promos Type: Creature — Cat Beast Rarity: Rare Cost: {4}{W}{W} Vigilance

put target permanent on top of its owner's library

Steam Vents [Guildpact] Aether Revolt then sacrifice it unless youSet: Guildpact Type: Land Island Mountain Rarity: Rare ({T}: Add {U} or {R}.) As Steam Vents enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.