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://paradoxtcg.com/cdn/shop/files/9ba845ed-7948-50e9-9cb5-18a19c67dd32.png?v=1737052937&width=1445)
