Hag Eye as Replacement for Arcane Eye!

[granny]

Covens often use one or two ogres as spies, sending them into the world beyond after polymorphing them into less threatening creatures.

These minions frequently wear a special magical gem called a hag eye. A hag eye is made from the real eye of a coven's previous victim. It appears to the casual observer to be no more than a low-value gem, but if viewed through a gem of True Seeing, a disembodied eye can be seen trapped in the hag eye's interior. This hidden eye is magically connected to the coven that created the hag eye. All three members of the coven can see whatever the hag eye is pointed at. Hag eyes are usually placed on a medallion or brooch worn by one of the hag's polymorphed servants. Occasionally hag eyes are given as gifts to unsuspecting victims whom the hags want to monitor.

Wikipedia

Following this idea, here it comes my suggestion: some sort of gear or temporary effect that allows the caster to see everything a target does. There are several flavors for this:

[LIST=1]

• You enchant a gear the same way you would bestow curse upon it. The user of the gear might roll a spellcraft check to know it is enchanted.


• You "bestow" the hag eye upon the target directly, giving the property to some jewelry the target is using.


• You do it with a single caster


• The more casters you involve in it, the longer the duration and the lesser is the DC