Chaosmonger Goblins

Reckless {1}, Pay 2 life. (You may cast this spell for
its reckless cost. If you do, lands tapped this way don't
untap during your next untap step.)
At the beginning of each opponent's end step, if
their life total is less than their starting life total,
untap target land.
Guiding and growing plants are basically the
same thing.