For the sake of balance, you should not be able to stack items that gives x amount of x to your teammates in PvP.
That’s a pretty low roll, in fact you can get +200 health with that single item alone.
Imagine having five of your teammates having that item (which isn’t unlikely since premades are fairly popular), you would have over +1k health for each member of your party.
Immunity for 5 seconds with a 60 seconds cooldown really have no place in a PVP game. That’s just insane and you should either increase the cooldown to either five minutes or give it another activated bonus.