Now if you have stratagem, then play it against Me.
If you have any schemes, go ahead and scheme
If you are cunning, then try your cunning against Me
So if you have a plan, plan against me (now)
So if (there) was for you (a) plot/conspiracy , so plot/conspire against Me
If you know of any trick, go ahead and use it against me (God.
If you now have any conspiracy, carry it out on Me
`If now you have any stratagem, try your stratagem against me.
Then if you have any scheme (and trick to escape from the torment), try (that) against Me
`If you have any device try it against Me (to escape this punishment).
So if you have a plot, use it against Me (Allah )