Bolas's Citadel

Bolas's Citadel {3}{B}{B}{B}

Legendary Artifact
You may look at the top card of your library any time.
You may play the top card of your library. If you cast a spell this way, pay life equal to its converted mana cost rather than pay its mana cost.
{T}, Sacrifice ten nonland permanents: Each opponent loses 10 life.
Edition: [WAR] War of the Spark ( R · #79 )