Watchers of the Abyss

{b}: Add a 0/-1 Darkness to this creature, then copy this creature, any copies of this card are
non-legendary and does not retain its effects or counters.

If this creature has 3 Darkness counters, all Human Watchers Subtypes have +4/+0.

"They acted in the dark, seeking out any sign of the Abyss, fighting a constant war with its abominations."