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"Feeding spirits" is a specific technique that can be used to increase the number of spirits in a neutral stack almost infinitely (in reality, after the battle, there will be no more than 4000 of them, although during the battle, their number can be as large as you want). This is achieved by attacking the spirits and feeding them a large number of your own creatures. The effect can be greatly enhanced by using the Mirror Image spell.
I've never done this because it's forbidden, but as far as I remember, to increase the number, you need to attack again after passing the turn. If you attack on the same day, the number will remain the same.