Whateve. Some call it triple nuke, some call it SpOD (Spell Of Doom, not Stunning Palm of Doom), and you, call it uber-cannon.
Personally I'd stick with triple nuke. uber-cannon is reserved for the black citadel (that's an ubercannon).
In RoC, the sequence goes Nova, Coil, Swarm. Nova first so that fast heroes (like the damned Demon hunter) won't run too far when he sees you beginning the SpOD. Swarm is last so that if the hero has less than 200 HP (and thus receive less than 200 damage from swarm damage distribution), the extra damage goes to other nearby units. By the end of the sequence you should be able to cast another coil - should the enemy lives.
In TFT, you have a wider choice. When going mass fiends I find the CL to be a really uber-good second hero. Those big bad beetle bugs make a good tank (lvl 3 scarab have the HP of a footman !), and there's five of them, and they cost a mere 30 mana. Third hero is the lich.
While the total damage is less than when what you would have when going with DK,DL,Lich combo, it's still pretty powerful. First because we have the stunning impale !, second because I'm using mass fiends (with statues they can last for a really long while). With this tactic I'd go with Rage Winterchill, coil, nova, impale - then coil again. This would make the reduction in damage less noticeable, not like you would notice it anyway with fiends FFing the poor busted bastard.