Tomb of the Golden Ones

Tomb of the Golden Ones Enters the battlefield exerted.
{t}: Add {g}{g} or one mana of any color to your mana pool.
{t}: Add {w}{u}{b}{r}{g} to your mana pool. Activate this ability only if you control five or more forests and five or more other lands.
{5}{w}{u}{u}{b}{r}{g}{g}{g}, {t}: You gain 1000 life. Put a 20/20 Multicolored Golden creature token and twenty 5/5 Multicolored Golden creature tokens onto the battlefield.