The reason for this is that cables incur signal loss so longer the cable, more the loss of signal incurred
Selling and buying are part of the game for most players, so knowing when to buy new cards and sets and when to sell your old cards is crucial
If you already run cards like Agent of Treachery
This theme works on three levels: Payoffs (i.e., Judge Magister Gabranth, Al Bhed Salvagers) Sacrifice outlets (i.e., Phantom Train, Namazu Trader, Ahriman) Fodder (Hecteyes, job select equipment, Rufus Shinras poor disposable dog) A good WB deck has a healthy mix of all three, plus lots of strong removal spells like White Auracite and Sephiroth's Intervention
They were given out as promotional product during the first set release
The only exception is where the set has a theme and, while that effect would normally be narrow, it's not in that particular environment