The New stance tank (Factions)

I was on guildwiki yesterday looking at skills for factions and was uber impressed by the powerof the new factions protection prayers skills, this one in particular:

Life Sheath {Elite}:
For the next 20 seconds, the next 30...126 damage target ally would take is negated.

Energy: 5
Cast: 1
Recharge:7

So i decided to make a pure defense wammo stance tank build using these skills.

Attributes:
Protection Prayers:10
Strength:14 (10+3+1)
Tactics: 13 (11+3)
Sword/Axe/hammer: 0 (im sry, but you will not die )

Skills:
Life Sheath {Elite}
Shield Stance
Renewing Smash
"Watch yourself"
Dolyak Signet
Healing signet
Vital blessing
Balthazars Spirit

How to:
Obviously factions is not yet out so i cannot try this out yet but in theory it should go a little something like this:

Keep these on at all times (or almost)
Life Sheath {elite}
Shield Stance (use renewing smash to achieve this)
Balthazars Spirit
"Watch yourself"
Dolyak Signet
Vital Blessing

This build is made for areas like sorrows furnace. If done properly it would remove the need for a healer or bonder to make it a 3 man run at the same speed or almsot as a 5man. (once again in theory)

Pros:
You can alone take all dmg w/o much trouble if you are not some wammo-head
If you can go w/o a bonder or healer you can really improve the drop rates

Cons:
No rez
No hex or condition removal
would need that the necro go part heal (1skill)

All tips and comments greatly appreciated.

What about sup. strenght rune, then you would be able to get those lovely Sentinels, 100 armour armor set.

Seems like you'd run out of energy easily.

Shield Guardian:
Enchantment Spell. For 10 seconds, target ally has a 75% chance to block incoming attacks. The next time target ally blocks an attack, that ally and all nearby allies are healed for 16...67 and Shield Guardian ends.

Not only that, but I'm fairly certain block doesn't stack in that way.