Deckbuilders that are more familiar with cEDH might be able to point you towards better combos than what I came up with
If Im playing a tapped colorless source, its Cathedral of War
It can target a level 7 (Red-Eyes) or level 8 (Blue-Eyes) monster in the graveyard and special summon it
However, when you pull something more special, they feel very special, and Im delighted to report that in our smallish sample, that happened a lot more often than I was expecting
Where Aang, Swift Savior really excites me is in conjunction with cost reduction creatures like Quantum Riddler
it helped that "Spirit Dragon" countered many of the then-meta Decks (its GY negate hurt "Burning Abyss", the "Neither player can Special Summon 2 or more monsters" effect countered Pendulum), and that those Decks were nerfed by the banlist