Ok, just for kicks, this is what I came up with:

Ten man raid, nine 45/0/26 DKS, one 40/26/5. 10 Blood Auras, 9 Ghouls, 1 Improved Icy Talons. DKs spam disease, Heart Strike/Blood Strike, and DS when it's available. Working a round robin Rune Tap, the Main Tank DK gets 40% of their DPS +3.66% of their Max Health/second, + whatever Death Strike generates, + Whatever they get from blood worms, +4%/hit if Mark of Blood is applicable. Now this does rely on some pretty intensive timing and group swapping of the MT, but it should theoretically work.

Same thing more or less applies to 25 man raids, except you can rotate in more rune taps and you get a higher % of stacking Blood Auras.