Seal of Insight
14% of base mana
Instant
Fills the Paladin with divine power for 30 min, giving each single-target melee attack a chance to heal the Paladin for (0.15 * AP.15 * holy power) and restore 4% of the Paladin's base mana. Only one Seal can be active on the Paladin at any one time.
Does it have an ICD, and how long is it?
I used the only Mastery spell power weapon I have (unenchanted
Amani Scepter of Rites) on a test dummy. With Kings-only, I lost 1k dps, I gained 1.1k per WoG, and I was getting ~1.9k heal per SoI tick.The threat loss seems like it would be tolerable. With a
Lightforged Elementium Hammer+ 
Enchant Weapon - Power Torrent, the heals should increase, and the lost dps should decrease due to improved damage from spells that use spell power coefficient as part of their total damage. I'm having a guildie make me one, and I'll post logs on its effectiveness, or lack thereof. I'm sure someone is simming this, but I like actually experimenting with this. Good or bad, a return to Paladin Spell Power Tanking is at least interesting.Important note: I still use the
Obsidium Cleaver or 
Unbreakable Guardian for actual tanking. I am discussing Spell Power tanking not as the new in thing, but as something to experiment with and see if it has even a situational use. My guess is that on a Halfus-esque encounter, where the tank has a minute or three lead time, this will be a viable strat, requiring a weapon-swap/Seal-swap when the raid gets around to the boss.
