Murder coins.

So most of the time the Murderers don't stand a chance against the guns from the armed bystanders and this could sometimes result into a draw or the murderers losing.

So I thought this would be a great idea to give the murderers a little something that will make them stronger.
With every kill the murderer gets he will receive 1 "Murder coin".
With this coin he will be able to buy something in the murder shop and the coins will reset every round and are only able for the murderer.
Now the shop:

Airstrike - Will drop 1 big bomb on the place where the murderer is looking when he right clicks the redstone block (Cost: 3 Murder coins.)
Gun - Will give the murderer a magnum with only 1 bullet. Same strength as the one the armed bystanders are using (Cost: 2 Murder coins.)
Sword - Will upgrade the diamond sword with a sharpness 1 enchantment (Cost: 2 Murder coins)
Grenade - Will give the murderer multiple grenades (Possibly 2)(Cost: 1 Murder coins)
False chat - Will give a false warning that someone is a murderer even when he isn't. Still has the chance locating the actual murderer. (Cost: 2 Murder coins)

That's all I could think of right now. I tried to keep them as original as possible. Give me some feedback on those ideas!