[quote]This is more of a variation mode of Gambit rather than the other excellent ideas below. Kind of like the crucible side where you have quick play, the mode of the week (rumble, supremecy, etc.) This would be in addition to regular Gambit.
Create a chaos mode where it acts like the Vault of Glass Atheon encounter. A random player from both teams are transported to the other side every xx seconds or so, not at the same time. Overlapping transporting is fine, but not necessary. This will push for quicker deposits of motes.
Portals can only be used as an exit only, so if your team starts losing quickly, and you are in a bad position you can run for the portal to get back and assist, or if you just don't want to do the PVP part you have an out.
Once the invaders are in, the 30 seconds they have they start losing 3% of their shield every second so this incentivizes them to get kills quickly.
A variation of the last part is that after 15 seconds the adds turn on the invader as well. If the team kills the invader it heals the invading sides prime evil.
Or use both to create major chaos.[/quote]
This i like.