Increase Life Leech with Melee attacks and Goin' Constructor based on the percentage of your missing Health. Additionally, Melee and Goin' Constructor eliminations have a chance to conjure a Phantasm (targets a nearby enemy, dealing damage in a 0.5 tile radius).
Arleen Izza is really good in missions where you have bunch of husks in your face, because that's where her Life Leech really shines. You can replace Assassination with Energy Syphon if you feel like you need more sustainability. Weapon that I used: Surround Pound