Suggestion: Training mod for raids

Hello,

Many players are playing raids to get their personal best in phase of the game. Heroic tanks goes down quite fast in our middle powered guild (top 200 this month).

Can we get a practice mode of raids and for each phase? Obviously we could artificially create such environment but it would be interesting.

I hope we also get a skirmish mode where we could just fight any ally arena team (or guildmate).