Yggdrasil, World Tree

When Yggdrasil ,World Tree enters the battlefield, you gain 2 life, then draw a card.
{t}: Add one mana of any color.
When those blades cut, they cause tears that feed the
well of Urdr that lies beside the world tree, and the
well gives the water that keeps Yggdrasil alive, and if Yggdrasil dies then the world dies, and so the well
must be kept filled and for
that there must be tears.