Opera turret

Put an opera counter on each turret you control,
creatures with opera counters on them have
-1/+0 and gain indestructible until the counter
is removed. If the turrets power is already 0, it is
not changed.
When opera turret leaves the battlefield, remove
opera counters from all turrets you control. If an
opponent controls a turret with an opera counter
on it, they lose 5 life.