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 (White Border) [Mystery Booster 2]](http://tothetablebgc.myshopify.com/cdn/shop/files/5a16665a-2600-460a-a5ad-417930fda62c_867b7b03-c29b-4ce0-ba66-b1ae697a6422.png?v=1776563846&width=1445)
