Abzan Runemark

Common Auras built on the +2/+2 chassis usually price out at two mana, so the extra generic mana here buys the conditional vigilance riding on top. The structure is the tell: the keyword is gated behind controlling a black or green permanent, which marks this as a wedge-color reward rather than a generic white aggro tool. The base buff lands no matter what, but the card pays a bonus for staying inside the Abzan colors, the same nudge a hybrid cost or a converge clause uses to bend a deck toward a particular spread of permanents. That gate is also what keeps the rate honest at common: a flat +2/+2 with unconditional vigilance would hand out too much sticky tempo for the rarity, so the keyword only switches on once you have committed to the right colors. Vigilance is the right keyword for the intent, too, since it lets a creature press an attack and still sit back on defense, exactly the grindy, two-way posture a slow three-color life-and-attrition deck wants from its bodies. The design says less about raw power than about identity enforcement: a buff that quietly asks which colors you are actually playing, and rewards you only when the answer points toward black and green.