Zarn, soul of the forest

grave-legion "pay 1 life: add {g} to your mana
pool, use this ability only once per turn"
(creatures in your graveyard gain this ability, it
can be used from the graveyard).
when Zarn, soul of the forest enters the
battlefield put a 3/3 black and green horse
elemental creature token onto the battlefield
with "when this creature dies add {b}{b} to
your mana pool"