The Heart of Lorkhan

Activated abilities of creatures cost {1} less to
activate. This effect can't reduce the mana in that
cost to less than one mana.
But when Trinimac and Auriel tried to destroy the
Heart of Lorkhan it laughed at them. It said,
"This Heart is the heart of the world, for one was
made to satisfy the other." So Auriel fastened
the thing to an arrow and let it fly long into the sea,
where no aspect of the new world may ever find it.