Black Sun's Boon

Black creatures get +1/+1 and have menace.
Nonblack creatures get -1/-1.
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"At it's zenith, it becomes a harbinger of twlight, and
dispels our wards and healing seals. Our enemies, still
yet unknown, now become numerous and mighty.
What awaits for us in the dark may yet be only sorrow,
as we become that which we despise most, and what it
simply beckons."