You may look at the top card of your library any time. You may play lands and cast spells from the top of your library. If you cast a spell this way, pay life equal to its mana value rather than pay its mana cost. {T}, Sacrifice ten nonland permanents: Each opponent loses 10 life.
![Bolas's Citadel (Promo Pack) [War of the Spark Promos]](http://www.cosmicgames.com/cdn/shop/files/cb51c4f3-b1c8-4741-98a9-0fb8d39267f3_74ddf87d-3839-4178-a770-159ed17a059e.png?v=1773396770&width=1445)
