Troop Practice Mode

Right bottom corner their should be a mode that let's you practice with the troops at your army camp to plan or make strategic attacks.
-You can only Practice when Shields active.
-You can only Practice your own Base or Clan mates Bases.
-if you want to practice on clan mates bases you have to request it.
-Once your done practicing the base will still be ok
-Practice Costs 1,000 elixir
-troops used in practice will be ok when practice is over

I only hope this idea gets submitted!

What if your friend changes his/her base to what the war target/ revenge target's base looks like. This has been explained many times, it is EASILY ​exploitable.