WHat if? Varus

What if Varus' passive was changed to give infinite stacking AS?

Like:

Living Vengeance: Varus permanent gains Attack Speed on kills. .2% on Minion kills, and .5% on champion and large minion/monster kills.

so at 200 CS he would have roughly 45% increase AS (Depending on how many large minions he got.)

Obviously this would have to be tweaked and balanced, these numbers are just what I thought up.