Ruins of Harrenhal

Sacrifice Ruins of Harrenhal: Add three mana of
any color to your mana pool. You lose 6 life.
"Greatest fortress ever built. Tallest towers, the
strongest walls. The great hall had thirty-five paths.
Thirty-five, can you imagine? Look at it now, a
blasted ruin. Do you know what happened?
-"Dragons."
"Yes, dragons happened."
—Tywin Lannister to Arya Stark