User blog comment:Zambu/Useless passives/@comment-2094543-20130501151503/@comment-8162360-20130501152523

Deadly Cadence is extremely strong in laning phase and even later game. It keeps you from having to back and it makes her an extremely acceptional for farming. It makes her combo easier to land.

Because think if she had a different passive. Her Twin Fangs would end up not working because the mana usage is so high.. This decreases her mana usage so she can fight without going oom.