Bolas's Citadel (PWAR) #79 [EN/F] s/o

{3}{B}{B}{B} · Legendary Artifact · 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. · Illustrated by Piotr Dura · War of the Spark Promos #79 · EDHREC rank 263 · Magic: The Gathering, MTG