You can't limit discs. You could easily lose 20 discs on 1 island green. What then, you have to go home?
FWIW, in ball golf, if you run out of balls in a tournament you go home. It happened to John Daly in the Australian Open. He hit 6 or 7 balls in the water on one hole, and didn't have anymore. Had to withdraw.
Limiting the number of discs that can be carried is a good idea, though I agree with New, that the mold limit would be really hard (if not impossible) to enforce. Also, I am not sure it would actually serve a purpose.
I would have to remove a few discs to get down to 7 / 25. I would probably go with this:
Aviar
1 - 12x KC Pro (New - Stable drives backup)
1 - KC Glo (all putter shots outside 50ft.)
2 - DX P&A (putting, anhyzer drives)
Roc
1 - DX (beat, anhyzers)
2 - KC Pro (1 Thrower, 1 New)
1 - KC Glo (unthrown, backup)
Pain
1 - GL (Stable/OS shots)
Warship
1 - GL (laser straight shots)
Leopard
1 - Star (Straigt and Anhyzer shots)
3 - Champion (1 Worn in, 1 New, 1 CFR Glow)
Saint
2 - GL (most drives, straight, stable)
Firebird
1 - I-Dye Champion (Beat, FH, OH)
1 - Star (New, Crazy OS)
I would have to drop these from my current bag:
Starfire - 1 - Star (Wind driver, FH)
Viking - 1 - Champion (Rarely thrown, backup to Saints)
Sword - 1 - Tournament (Open Field max D, rarely thrown)
The Starfire would be missed, though I could drop the Warship to keep it. It would depend on the course and wind as to which one I would carry.