since there is no crit-based rune, i have a suggestion

you put it in Domination row 1 something like every time you critically strike, you get a bonus one third of you current critical chance and bonus atk speed for the same amount and this buff can stack twice

this way you get a hundred percent crit with one of these ( ) and

one of the ideas is that this gives crit champions (who aren't ) have a more synergistic reason to pick up domination as their secondary tree which makes Celerity + Gathering or Absolute + Gathering much less of a crutch set

another thing it adds is it opens up more creative options for adc runes in terms of what they take as the other rune in their secondary tree

i'd also want to suggest moving taste of blood into a keystone spot and combining it with hail of blades but that's a whole 'nother balancing/creative subject that i have neither the credibility/compensation to be addressing