We have this item called "Scroll of Multiplication". It is quite fun, but at the moment somewhat "unbalanced". The scroll of multiplication multiplies your units by 10.
Here we used 3 of them in a row so: 10*10*10=1000!
The actual gameplay version of this function will have certain limits on which units are multiplied and how powerful the multiplied units are. The current results are amusing even though not viable as a final mechanic.