Omnath, Locus of Finality

Landfall —Whenever a land enters the battlefield
under your control, other elementals you control
get: {t}: Add one mana of any color.
Elementals you control get +1/+1.
{t}: Add {w}{u}{b}{r}{g} to your mana pool.
It was only a matter of time. We just didn't think it
was going to be so soon.