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.
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![Bolas's Citadel [WAR - 79] - Cartes Sportives Rive Sud](http://cartessportivesrivesud.com/cdn/shop/files/bolass-citadel-war-79-magic-the-gathering-singles-3989962-8850920_1024x.jpg?v=1778616915)