Bolas's Citadel [WAR - 79]

Rarity: R #: 79 Creature Type or Sub Type: Legendary Artifact Rules Text Contains: You may look at the top card of your library any time. You may play the top card of your library. If you cast a spell this way, pay life equal to its converted mana cost rather than pay its mana cost. T, Sacrifice ten nonland permanents: Each opponent loses 10 life.