Unnatural Silver Moon

{t}{c}
{2}{t} If you control Karn, The Superior King, sacrifice 1 powering counter.
When Unnatural Silver Moon enters the battlefield, put 4 powering counters.
If there is 0 powering counters on Unnatural
Silver Moon, flip it over.
Eventually the creatures looked up to the night sky,
they looked to their familiar moon, to their horror,
there were 2.