I was looking through the forums for anything on the
[The Black Heart] and how useful it was for a prot warrior. I wasn't able to find anything so I decided to do my own theory crafting and I wanted to post my results here to make sure I didn't screw anything up.
I used the spreadsheet and unhid the "Trinkets" page. I edited the "Seal of the Pantheon" proc information so that it gave 7056 armor instead of the default 3570. I left the uptime at 1/6 because according to wowhead the proc rate is about once per minute, with a 10 sec duration.
Back on the main "Gearlist" page I deleted the def bonus and added in the 126 stam.
The spreadsheet updated to give an AEP of 2331 with default weighting.
I haven't modified the stat weights but with default values this trinket has the highest AEP in the game, unless of course I screwed something up.
Hopefully you guys can replicate what I did and use it to play around with your stats. You can also add black heart to the trinkets page and to the GearList page so you can actually see it in your Equip list without having to realize that Seal of the Pantheon is The Black Heart. I only used Seal because it has very similar mechanics and there was a higher probability of it working correctly if there was some hidden code in the spreadsheet I didn't see.
Please let me know if there has been any research done on this that I may have missed and let me know if my numbers seem accurate.
PS. I use the Excel version of the spreadsheet so I do not know what steps need to be used to add the trinket to the open office version.