Favor of the Overbeing
Most Auras that scale read off the caster: pay more, get more. This one reads off the target, and specifically off its current colors. A green creature picks up vigilance and a point in each direction; a blue creature picks up flying and the same point; a creature that wears both colors collects all of it for +2/+2 with vigilance and flying. The hybrid pip in the cost is the misdirection here. It looks like the load-bearing part, the thing that lets either color cast the spell, but the actual engine sits on the creature you target. The Aura is a quiet argument for the green-blue overlap: the more a body shares both halves of that color pair, the more this gives back. On a single-colored creature it settles into an ordinary +1/+1 with one keyword, which is the floor that keeps the gold-creature payoff from being free. This kind of card, reading color identity off whatever sits on the battlefield rather than off the mana that paid for the effect, was a recurring experiment in early hybrid-and-chroma design: cards that asked you to care not just what you cast but what you cast it onto, and that rewarded a board deliberately built to live in two colors at once.
