Bolas's Citadel (WAR) from War of the Spark, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Jonas De Ro
• Card Text:
  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.