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 [War of the Spark Prerelease Promos]](http://tothetablebgc.myshopify.com/cdn/shop/files/bb6e5c8c-2c03-45b2-a0c0-e3a365e2fead.png?v=1776598293&width=1445)
