Adapted from the Icy Veins rotation, this is pretty close to optimal for Blood DK. Each time you select a new target, it prioritizes marrowrend to get the initial bone shield buff up and blood boil for blood plague. It will cast death and decay at your feet similar to consecration so that you recharge runic power while you stand in it. Everything else is prioritized pretty closely to the Icy Veins priorities. Note the marrowrend sequence towards the end, which is intended to build 5+ stacks of bone shield for the ossuary bonus before weaving in the occasional heart strike for dps and healing. Hit your mod key to use death strike to heal or spend runic power. Enjoy.
Talents are 3,1,1,2,1,3,3
Run as a priority sequence.
/cast [mod,nochanneling] death strike
/castsequence [nomod,nochanneling] reset=target marrowrend, null
/castsequence [nomod,nochanneling] reset=target blood boil, null
/cast [nomod,nochanneling,@player] death and decay
/cast [nochanneling] blooddrinker
/castsequence [nomod,nochanneling] reset=target marrowrend, marrowrend, heart strike
/cast [nomod,nochanneling] consumption
/cast [nomod,nochanneling] blood boil