Consider water

Ubiquitous 

Life to those who thirst

Death in flood and storm

Sweet in bubbling springs

Toxic to us if sea

Fluid extraordinaire 

Lubricant to liquify

Harnessed meekly in

Kitchen Factory and lab

Yet wild in icebergs rapids

Raging falls and frothing seas

A beast of elemental power

Tamed by man but only just

As balance is it’s only tether

Out of which it mysteriously 

Either disappears or rages