Clockwork Refuge

[When Clockwork Refuge enters the battlefield,
create a copy of it without text in square brackets
for each non-token artifact you control. At the
beginning of your end step, exile a copy of
Clockwork Refuge. If you can't, exile all non-land
permanents you control.]
Shroud, Indestructible, cannot be sacrificed.
You have hexproof. Your life total cannot
change. Artifacts you control are indestructible.
"We will be safe here... for a time." - Michael