Bolas's Citadel - Final Fantasy: Through the Ages #7

Bolas's Citadel

Set: Final Fantasy: Through the Ages (FCA)
Collector Number: 7
Type: Legendary Artifact
Rarity: Rare
Mana Value: 6.0

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.