Gannon dwarfs the competition by offering Azorious recursion at no extra cost no mana, or cards to discard, just the mana to cast the spell
You can even select which permanent types to exile if you want to preserve part of your board
This is down to there already being very good Ursulas for her to Shift onto and having the card disadvantage mitigated with her ability
Once played for six mana, it buffs all creatures of a chosen type with +2/+2, first strike, and trample
This list is about those Dragons, the ones that not only make you dream of doing something cool, but actually make it possible
Cards like Mycosynth Lattice or Trinisphere push Karn from irritating to game-ending, and the fact that this happens without attacking explains why he ranks among good planeswalkers, arguably one of the best to ever get printed for artifact-heavy metas