Komm, Susser Tod

Flash
When the Komm, Susser Tod enters the battlefield, phase out all non-land permanents.
At the beginning of your upkeep, flip a coin.
If heads, phase in one of the permanents at
random back to their owners control. If tails,
phase all permanents back in phased out with
Komm, Susser Tod, remove indestructible from
all creatures, and destroy all non-land permanents.