Yogon, Vast Nightmare

Yogon, Vast Nightmare enters the battlefield
tapped with six slumber counters on it.
As long as Yogon has a slumber counter on it,
it's a land. (It's not a creature.)
Whenever a creature dies, remove a slumber
counter from Yogon and you gain 1 life.
{t}, Pay life equal to the slumber counters on
Yogon: Add {b}{g}.