Toad, I like. My Fluffy Squishy uses it as well as my “Walking Simulator”
But Revenant pretty much needs you to go for Dying God route and I hate that devotion. Also not exactly a fan of Revenant proc since the Leash range is rather low for a pet build (or was, the last time I tried using it) and I find those pets rather useless even as RR appliers tbh.
Will the lifesteal keep pets alive with no other source of healing? No.
Will it help? Definitely.
Will it help Skeletons? Not even with the most defensive setup.
Skeletons, even with their buffs are still fragile compared to the actual tanks like Briarthorn, Blightfiend etc. Imo, it is best to get them to a point where you are not forced to constantly resummon them and then focus on offensive stats from there. Or… go for the low CD, more Skeletons summoned at once route.
Ofcourse, nothing will actually make any Pet Scaled Pet outside of Reap Spirit immortal or anything like that and even Reap Spirits technically aren’t “immortal”, but just really hard to kill. But, if you do want to go that route, Healing is still your best option instead of Life Steal. And in that department, Wendigo Totem is pretty much at the top, followed by the likes of Blood of Dreeg and all that.