Its a good idea on paper however it will quickly devolve into the parsing meta. There will be no longer a thoughtful of meaningful change behind the ability. It will just fall into use what does the most or provides the most damage . Ultimately, you'd still be pressing two buttons or raising your APM/workload for something that should only need one button to begin with.

Looking back, making SB Dark Arts go away was their best design decision so far. I should cut them some slack.