Wraith, Vicious Vigilante Loxi: This is a very solid piece for a flying men deck, although notably I think the colors restrict it from really making waves in that archetype (and since it doesn't actually have flying, it loses value in a lot of other Azorious options)
I like that it just counts the amount of colors, and not the mana value, allowing you to turn your early bodies into more impactful multicolor creatures late game
Sacrifice a creature whose value has already been used up, like Arboreal Grazer, Burning-Tree Emissary or Reclamation Sage
Feel free to target these as random additions to trades because they should move easily close to retail
The choices you make on which cards to ink, when to quest, and when to challenge give the player lots of space to feel in control of their strategy