Even with the nutty life steal reaper will be bottom tier. There are way to many heroes that can deal with him.
Hanzo/Widow/Ashe still have an ez time hitting his giant head hitbox with his slow movement.
McCree will still shut him down with either headshots at range or a flash bang up close.
Sombra’s hack still makes him a free kill.
Pharah counters everything about reapers kit.
Bastion will melt him before he gets close enough to be a threat.
Tracer can dance around him and poke him to death or just one clip him.
Genji has too many mobility and defensive options for Reaper to be a threat.
Zen can deal with reaper.
Lucio can still duel reaper.
I dont see Reaper being very effective past high gold to mid/low plat.