"So if you have a plan," by which you might be saved from God's punishment, "then plan against Me," meaning: you are not capable of that. Interpretation of Sūrat al-Mursalāt from verse (41-50).
﴿فَإِن كَانَ لكم كيد﴾ تَنْجُوْنَ بِهِ مِنْ عَذَابِ اللَّهِ ﴿فكيدون﴾ أَيْ: أَنَّكُمْ لَا تَقْدِرُونَ عَلَى ذَلِك.
تَفْسِير سُورَة المرسلات من آيَة (٤١ - ٥٠)