They should just bring back cleansing totem as a AOE cleanse spirit with short duration and long cooldown
Cleansing Totem: Summons a water totem lasting 3 sec that removes all magic and curse debuffs from allies within 40 yards and makes them immune to debuffs of that type. 3 min cooldown.
While they're at it they should also bring back
Sentry Totem: Summons an Air Totem lasting 20 sec that exposes all hidden and invisible enemies within 10 yards. 20 sec cooldown.