This has been removed from Heroes of the Storm. 
Tier 2 (Hero Level 4)
Basic attacks heal for 15% of the damage dealt to the primary target.
Patch changes[]
(Patch July 10, 2018) Note: Removed from Raynor.
(Patch November 29, 2017) Note: Removed from Sgt. Hammer- (Patch September 13, 2016) Note: Removed from Valla.
- (Patch May 17, 2016) Note: Removed from Falstad.
- (Patch March 29, 2016) Note: Has been renamed to Vigorous Assault.; Removed from Tychus.
- (Patch July 21, 2015) Note: Removed from Tyrael and Zeratul.