Wings of Hope
The +3 toughness is the tell. Most flying-granting auras of this era stopped at evasion and maybe a small power bump, because the point was to push a creature over the goal line. This one inverts the priority: the defensive boost outpaces the offensive one, turning a ground blocker into a durable flying wall that happens to keep attacking when it wants to. The flying matters in both directions, letting the enchanted creature chase down evasive threats it could never have blocked otherwise. That makes it a survival aura first and an evasion aura second, which is an unusual posture for a two-color permanent that asks you to commit a card and a turn to a single creature. The Azorius color pairing is doing exactly what it says it does here: white's protective instinct and blue's flying converge on a creature you want to keep alive rather than one you want to swing for the win. Aura economy being what it is (one removal spell answers both cards), this lives or dies on whether the toughness buffer changes a real combat math problem, and the +1/+3 line is tuned for precisely that calculation rather than for racing.
