Question: I would like to organize a game playing session for 140 people in the same room. I could just split them up into lots of small groups and organize a tournament. But then I started to wonder, are there any massively multiplayer non-online games? My restriction is that any material needed will have to be printed out.

Answer: 
Once the second Pledge enters the battlefield, the first one again starts granting protection from white to the Gnomes, which causes the second aura to fall off. This happens as a state-based action just after the second Pledge resolves.
Let's walk through this. Our starting state is:

> 
> **Gnome** is enchanted by **Colorless Pledge**.
> 
> 
> 

The following events occur:

* You cast a second Pledge, targeting Gnome
* Pledge resolves and attaches to Gnome

The state of the board is now:

> 
> **Gnome** is enchanted by **Colorless Pledge** and **White Pledge**. Gnome has Protection from White (except Colorless Pledge) and Protection from White (except White Pledge).
> 
> 
> 

Now, the active player would receive priority, and so state based actions are checked.

* All White auras except for Colorless Pledge are moved to the graveyard. White Pledge is moved to the graveyard.
* All White auras except for White Pledge are moved to the graveyard. Colorless Pledge is unaffected.

Your final board state is:

> 
> **Gnome** is enchanted by a **Colorless Pledge**
> 
> 
> 

At the end of the turn, the Colorless Pledge becomes White again, but remains attaches because an exception was specifically made for it.