Water Alchemist

When Water Alchemist enters the battlefield, create
a tapped Pure Water token (an artifact token with "{t}: Prevent the next 2 damage that would be dealt
to target creature or player this turn." and "{t},
Sacrifice Pure Water: Regenerate target creature
with toughness 2 or less.").
{t}: Untap another target permanent.
The simple means and more complex methods of
purifying Water is viewed with a humble reverence
that ensures the teachings pass from one generation to
the next.