The Worldstone

You may spend mana as though it were
mana of any color.
{t}: Add {c}{c}{c}{c}{c}.
The Worldstone. It was the power of creation and
the birth of our Eternal Conflict. From the High
Heavens to the Burning Hells, our desire to control
that power poisoned its very nature. And so...
I gave my life to destroy it
—Tyrael