The Chained Oblivion

As long as your life is less than or equal to
half your starting life total, The Chained Oblivion has indestructible.
Whenever a permanent you control leaves
the battlefield, each creature other than
The Chained Oblivion gets -2/-2 until end
of turn.
"The night the stars vanished, all of Exandria could hear the rattling of it's chains..."