Charles Ellicott Commentary Isaiah 47:12

"Stand now with thine enchantments, and with the multitude of thy sorceries, wherein thou hast labored from thy youth; if so be thou shalt be able to profit, if so be thou mayest prevail." — Isaiah 47:12 (ASV)

If so be thou shalt be able ... —The words come with a subtle tone of irony. Persevere in your enchantments ... perhaps you will be able to profit, perhaps you will strike terror.