One macro for priority targets in ICC.
Lord Marrowgar, targets Bone Spike if it is up then back to Lord Marrowgar.
Deathbringer Saurfang, targets Blood Beast if it is up then back to Deathbringer Saurfang.
Professor Putricide, targets Ooze if it is up, targets Gas Cloud if it is up then back to Professor Putricide.
Code:
/tar Bone Spike
/tar [noexists][dead] Lord Marrowgar
/tar Blood Beast
/tar [noexists][dead] Deathbringer Saurfang
/tar Volatile Ooze
/tar [noexists][dead] Gas Cloud
/tar [noexists][dead] Professor Putricide