Okay so the idea is pretty basic.
I want a game mode that only feature the vanguard heroes.

Why? Because it's simple.
I find it difficult sometimes to keep up with all the new tactics that arise with every new hero, so a back to basic gamemode that only feature a few heroes would be a refreshing change when all you want is to kick back and slaughter those you have perfected your tactics towards.

It's really just a for fun request and not something I expect people want or even will be added, but I would play that