Proc IO's (chance for heal)
I believe that is a per target deal.
Head of TRICK, the all Trick Arrow and Traps SG
Part of the Repeat Offenders
Still waiting for his Official BackAlleyBrawler No-Prize

It can proc on each target. The % chance to proc is pretty low. You are actually better off just slotting set bonuses that give +regen.
-Insanity is doing the same thing over and over again and expecting different results. - Albert Einstein.
-I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use. - Galileo Galilei
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I use this particular proc in Frozen Aura on my Ice tank. It is by no means reliable, however, for minor damage it actually works out pretty well. My tank gets about 95hp per proc and I've seen it proc like 5 times, simultaneously (475hp). Of course, FA recharges in like ~6s for me so it's probably serving me a bit better than in another sleep with a longer recharge.
SG: Guadians of Paragon - VG: Paragon's Darkness
The Usual Suspects: Fimboolvetr (Icer Tank), Tsukiyomi (Mind/Psi/Ice Dom), Smiting Dragon (Dm/Sr Scrap), Widow Mortis (NW)
Up and Comers: Ameterasu (Km/Reg Scrap), Arrhymian (Elec/Nin Stalk), TDMKII (Bot/Traps MM)
This is one of the procs that's not a game changer by any stretch. I've used it heavily on a sonic/elec blapper concept I did, that had this proc in several attacks... i would see it heal me every other spawn or so... but I can't say it every did much to keep me alive.
I gotta make pain. I gotta make things right. I gotta stop what's comin'. 'Least I gotta try.
If I have a sleep IO chance to heal and I use it in an aoe sleep power, do I have a chance to heal per target hit or just once per cast.
Thanks.