This is my 4th or 5th champion suggestion...

Kazuko, The Arcana Supreme

Cost: 3150 IP / 790 RP

Gender: Female

Birthplace and Residence: Zaun

Weapon: Magic

Passive - Soul Absorption

Whenever one of Kazuko's abilities kill an enemy champion, she regains 50% of the mana she used.

Q - Ice Bolt

Range: 550          Cooldown: 15/13.5/12/10.5/9      Cost: 65/70/75/80/85 Mana

Kazuko shoots 3 Ice Bolts out of her hands, in a skillshot cone, dealing (70/80/90/100/110) Magic Damage (+0.75 AP), enemies which are hit are slowed for 1.5 seconds.

W - Spiritual Charge

Range: 600            Cooldown: 16/14/12/10/8        Cost: 50/65/80/95/110 Mana

Kazuko channels for 0.5 seconds before charging in a straight line, dealing (40/60/80/100/120) Physical Damage (+0.5 AD), any enemies which are hit are knocked into the air and are stunned for 0.5 seconds.

E - Soul Exchange

Range: Line of Sight                      Cooldown: 25/22/19/16/13                      Cost: 70/85/100/115/130 Mana

Kazuko calls on the spirits of her dead ancestors, channeling for 1.5 seconds, to trade positions with the nearest enemy champion.

R - Soul Rend

Range: Global             Cooldown: 120/105/90           Cost: 130/160/190 Mana

Kazuko channels for 5 seconds before unleashing a Wave of Spititual Energy, which deals (250/300/350) Magic Damage (+1.0 AP), any enemies affected are stunned for 2.5 seconds.