who does the effect of the agent of judgment-saturn and the agent of force-mars work. :cool:

It depends on who is controlling the card. If you're life points are higher than your opponents, you can tribute Saturn to inflict the difference as damage to your opponent. Similarly, if your LP are higher and your opponent has Saturn, you can Change of Heart Saturn to your side, then use his effect.

Mars is similar. If your life points are higher, then the ATK and DEF becomes the difference between the two.