Many of them proc when you are damaged.
Some Ward procs that are from spell attacks tho:
\aITEM -122436920 490662133:Ring of the Glade Protector\/a - Good Avatars
\aITEM -693943093 -1555230608 2059261066:Enspelled Vultak Eye\/a - Crafted in Nest
As for heal procs, look for stuff with the "Overflow" effect on it. I know just doing the RoK questlines should give you at least 1-2 items, but the heals aren't that big since they are for the whole group.
And obviously good luck getting the Avatar ring, I'd only see a caster getting that if all tanks had it along with alts, heh. If you outbid a tank expect to get /guildkicked
Xebnok is your best bet, along with the Nest item, but the Xebnok proc rate sucks, I wouldnt bother. Nest one will be more effective and is much cheaper anyways.
agressiv
Edit: the EOF fabled Soulfire staff has a heal proc as well, but I wouldn't wear that over the myth.