The idea of "has been devised" can be expressed with an active verb. Alternate translation: "This is the plan that God intends for the whole earth" (See: [[rc://en/ta/man/jit/figs-activepassive]])
God being ready to punish the nations is spoken of as if he raised his hand in order to hit them. The word "hand" may also represent his power. Alternate translation: "this is Yahweh's power to punish all the nations" or "this is how Yahweh will punish the nations" (See: [[rc://en/ta/man/jit/figs-metaphor]] and [[rc://en/ta/man/jit/figs-metonymy]])