The Lighthouse

The Lighthouse enters the battlefield tapped.
Discard a card, {t}: Add {w}{u}{b}{g} to your mana
pool, or, add one mana of any color to your
mana pool and put a light counter on
The Lighthouse.
Remove ten light counters from The Lighthouse:
Exile all graveyards, each opponent lose life
equal to the number of cards exiled this way.