## 1.13+

Funnily enough, the way to join team pillager is to literally join team pillager!

Run the following commands once:
```
team add pillager
team join pillager @s
```
This will create a team called "pillager" that you join.

Now, let's use your snippet to make all other raiders join team pillager. On a repeating command block, run:
```
team join pillager @e[type=#raider]
```

As long as that command is running, any new raider that is spawned will join your team and therefore not attack you, even when attacked.
You can also disable friendly fire for this team by running 
```
team modify pillager friendlyFire false
```

Happy raiding?