Black Sun's Twilight

Up to one target creature gets -X/-X until end of
turn. If X is 5 or more, return a creature card
with mana value X or less from your graveyard to
the battlefield tapped.
"Day 106: Endrek Sahr's power is absolute, com-
manding the sun to unleash its wrath upon her foes.
Her brood spreads, devouring all in their path."
-Diary Entry