An Idea for a Revenant buff

Now, hear me out:

From all the responses i've heard about revenant as a legend, where he ranks in the meta, etc. I think most people agree his ult can be a death sentence that does more harm than good and is ultimately a bit underwhelming.

A simple idea to give him a bit of a buff would be this:

Death Totem: Allows you and your teammates to enter shadow form. While in this form, you are able to gain health back for every kill recieved. If your health bar is at max while in shadow form, your speed is increased by 2% (or some small but noticeable number) and your movement sound is cut by 10%. All death boxes obtained from kills in shadow form will be transported to the death totem upon deactivation, serving as a giant death box that remains on the ground for ~60s

Also maybe a consideration for his tactical: When an enemy is effected by the Silence ability, alongside being unable to use their abilities, their sound also switches to the sound of a feint heartbeat while mostly muting all other sounds, and their vision darkening and pulsing along the edges of the screen (similar to when you are about to die when knocked)