Sona Ability (LoL): Power Chord

Accelerando: Sona gains 0.5 ability haste permanently for her basic abilities as she uses her abilities well which doesn't include her ultimate, up to a cap of 60 ability haste. Beyond that cap, further successful uses reduce her ultimate's remaining cooldown by 1.5 seconds each time instead.

Power Chord: Every 3 spell casts, Sona's next attack will deal 20−240 (+20% of ability power) bonus magic damage in addition to an additional effect depending on what kind of basic ability that Sona last activated.