Gaurdian Angel/sightstone build path change

So I wanted to create a valuable build path that moved away from building raw stats and also encouraged a more team oriented path for vision in the late game, but also removed the revival effect of G/A because it feels unheathly to have a revive item that gives a second life to people who are already ahead and I would like to get your opinions on this build path

1100 + 1000+1000 combine cost Name change to Guardians Cloak Stats given : +650 health +40 armor +40 magic resistance Unique passive- while in combat with enemy champions for 2.5 seconds increase self healing by 5%[+1% for every second after 2.5 seconds you are in combat up to 10%] (after reaching 10% must remain in combat with enemy champions or this effect is lost after 2 seconds) Unique active- (cannot be cast during hard cc) casts for 2.5 seconds then heals you for 125+15-30% of your maximum health 10-25% of your maximum mana (this effect is increased by 1% for every 60-43 damage you take during the cast -1 for every level) (150 second cool down reduced to 90 seconds if you die during cast)

this cast is like morgana ultimate, it cant be interrupted once it is cast but cannot be cast during hard cc, and you can move and operate like normal during its cast