What are the Benefits? Well, those ISB agents won't stay lost for long if they hit the lost pile, because you can retrieve one during your draw phase. And when you have a non-undercover ISB agent at a battleground, your Force Drains are +1 and Opponents Force Drains are -1 at same and related sites. How nice is that.
But what I wanted to know was, who is an ISB agent. The criteria is that they must have "ISB," "rebel," or "Rebellion" in their lore. If so, they are an ISB agent and a spy for the remainder of the game. I took a few moments to check the lore on all the cards (includeing SE) to see just how extensive the spy network was interlaced already. At first glance, I was surprised that there are only 15 possible agents for the ISB. But some of them were quite surprising!
In Special Edition, We get two unique ISB agents, Chyler, and Sergeant Torent, and a non-unique agent, the Outer-Rim Scout. It is this non-unique agent that makes this deck theme possible. But there are others in the ISB. Here is a list, including the ones listed above:
Chyler
outer-Rim Scout
Sergeant Torent
5D6-RA-7
Probe Droid
Admiral Ozzel
Col. Wullf Yularen
Corporal Derdram
Col. Vandolay
Lt. Pol Tredium
Officer Evax
Chall Bekan
Fozec
Snowtrooper Officer
Tarkin (Jedi Pack)
Veers (hoth 2-player)
As you can see, some surprises. Imagine Pol. Tredium doing his handing work undercover, no worries about being caught or battled. Or how about Chall. Place him undercover and let those aliens come flooding to the location at -1. Not only that, but you can pull out an Outer-Rim Scout. This is potent seeing as you only need to control two locations with ISB agents to get the Objective flipped (or 4 on the board).
So watch out Rebel Scum. there may be some new spies among your midsts.
Beakman