Evil God and anti-theodicy

[GrandizerII]

Isn't the idea of an omnimalevolent God as reasonable as an omnibenevolent God, and doesn't a reverse theodicy work just as well to justify the problem of good as the problem of evil?

And if so, isn't this a reductio ad absurdum argument against theism?

Stephen Law argued something along that line in his debate with WLC. To be honest, I'm not sure I buy this evil God argument as an effective counter against a God that's good. But I'm going to have to think about this first, and maybe get back to you later on this.