Okay, in that case you basically just need Messerschmidt’s Reaver.
You’ll probably want the Vyr’s set once you get into T10, but for T3 you could just run Messerschmidt’s Reaver in the cube and you should just be in Archon pretty much all the time since it takes care of the cooldown for you as long as you kill enough stuff. Messerschmidt’s Reaver takes one second off the cooldown of Archon each time you kill something, so if you use it in combination with a bit of cooldown reduction on your gear, as long as you kill about 30 enemies each Archon you’ll get Archon back right away.