Xaku - The Relentless Loss. Augment: Have augment equipped & cast The Lost
Gara - Mass Vitrify: While casting Mass Vitrify, the damage dealt into it is returned as the wall's health on cast end
Gara - Mending Splinters. Augment: Have augment equipped & with Splinter Storm active on yourself or allies, no buff icon indicating that you are healed by the number of targets affected by the ability (may not be intent of this thread but seems in same vein)
Rhino - Ironclad Charge. Augment: Have augment equipped & hit enemies with Charge