Spend gems to re-do an attack for practice only

I often curse myself for messing up an attack and would love the chance to try it again, even if it didn't change anything tangible.
I propose that players be allowed to spend a small amount of gems to re-do an attack (for no added loot or stars or anything). This could be applied to war attacks, raids, or builder base matches.
The same army would be used (no troops that were originally up deployed could be used).
Pro: a chance for players to practice and redeem themselves if only for their own sense of gratification and another way for supercell to collect gems.
Con: Possibility for abuse in war scouting by scouting multiple attack directions using only one war attack.
In my mind, those are huge pros and a minor con.

Actually thats a pretty big con to be fair because if the enemy has for eg 5 th9 bases in war and the first one attacks and messes up but then can spend gems to try again and gets it right he can then tell the next th9 how to attack tbe base correctly to get the 3 stars so im not in favour of this idea

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Originally Posted by Mrlk

Actually thats a pretty big con to be fair because if the enemy has for eg 5 th9 bases in war and the first one attacks and messes up but then can spend gems to try again and gets it right he can then tell the next th9 how to attack tbe base correctly to get the 3 stars so im not in favour of this idea

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That's a good point. Any re-dos of war attacks should not be allowed until the war has ended. I think that would solve the problem.