New spell!!!!tack

I have an idea about a new spell. Cloning spell. Doubles every troop for limited time or maybe for the rest of the attack. It would cost around 50g exiler 1hr to make unlocks th8 upgrades to lvl 3. First lvl would clone 3 troops (works best with Giants and other big troops not archer or barbs). Second lvl would add and extra 3 more and the the third lvl would add 3 more again. Upgrades once every th. Cost to upgrade first time would 1m second time 2.5m third time 4m. Leave any thoughts if you'd like to change it or add something.