Got a good idea for mark/dash

instead of making it do no real damage unless you dash to the target you hit, how about only letting champs who need it be able to take it, like champs with no poke whatsoever, or slow tanks who really lack in the area of damage output. I really don't think and need an extra gap closer/vision/poke anyway. I understand a spell isn't the same as an Item that you can restrict usage of like or . which is what brings me to plan B: make it an item instead of a spell. champs with poke will not need to build it, while champs without poke can build it and even the odds.