A New Strategy
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It has a similar weakness that I possessed back then when I was a mortal. Now that I am a God, I can easily generate mass using Divine Power or automatically eating from my large stash of meals inside of my Inventory almost automatically. However this thing has none of such powers. It also seems that it can only copy magic and the power of the body, it can even scan the DNA, or how else would it be able to recreate my dragon head like that?
However, he's also limited in that alongside its mass. As long as I can destroy its mass constantly, it'll reduce in size constantly and it will need to do the same it did with the ants, devour them to gain mass and more new power. It hasn't regenerated the humanoid arms and other parts it had before either, this means it lacks the ability to recall materialized parts it had before, or it has a limited amount it can use and store within its own memory.