zealots gear
lifesteal barely scales with healing power at all.
Zealot’s gear is actually pretty strong in builds that use blood magic. Not for the siphon traits, but for Transfusion, Life From Death, and Blood Bond (though that requires them fixing its incorrect scaling) and even Quickening Thirst to an extent. Running dagger mainhand and Signet of the Locust, we effectively run around with three healing skills. Consider this:
Life Siphon: scales at approximately 10% healing power per tick. Total of 90% scaling on a 12 second cooldown (9 with Quickening Thirst above 75%).
Signet of the Locust: 60% healing power per target, max of 300% at 5 targets.
Life From Death: 150% healing power scaling whenever you leave death shroud.
Consume Conditions: 100% healing power scaling, 10% per condition.
Transfusion: 20% per pulse, total of 180% scaling on base Necro and 240% on Reaper.