Hvergelmir, the Eldest Well

Pay 1 life, {t}: Add {u} or {w} to your mana pool.
{t}: Put a River counter on target land. If you
control eleven River counters, you win the game.
{1}{w}{u}, {t}: Gain X life where X is the number
of land you control with a River counter.
As Yggsrasil grew, one root stretched into Hvergelmir
and drew from its icy waters.