Understanding the timing of when your Concerted Effort or Bleeding Effect triggers is key, but its fun to mess around with cards that go ham with keywords
The goal was to self-bounce and recast your things to trigger ETB things (Mulldrifter), self-bounce things (Azorius Aethermage), leaves play things (Circuit Mender), cast things (Equilibrium) and tapping the dork for something valuable (Opposition), with a bounce of self-bounce (Erratic Portal) and a flicker backup theme (Far Traveler proper) in order to lean into the non-cast stuff
For three mana, Brutal Cathar is a 2/2 can function as a source of repeatable removal, exiling a creature whenever it enters the battlefield or transforms
This deck is so focused on dragons that even some of its ramp effects are tailor made for the tribe (Atarka Monument, Dragons Hoard), along with a good number of the other noncreature spells (Spit Flame, Crucible of Fire, Dragon Tempest)