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]](http://tothetablebgc.myshopify.com/cdn/shop/files/d2124603-d20e-40eb-97f0-a66323397ac2.png?v=1776409013&width=1445)
