Neat idea! I'd like it if the controls were more consolidated: If I need to use the mouse, the keyboard inputs need to require only one hand. The spells were sometimes very hard to tell apart, it would be good to make both the selected and target spell take up more screen real estate when we're comparing such similar images. Once you started to get the rhythm of it this was genuinely fun, I like to imagine a setup where all the spells stay wherever you left them last and you get a small enough table space that you just can't help but end up making a mess for yourself as the rounds go on!