Mardu Runemark

The Runemark cycle teaches a lesson about wedge identities at common rarity: a flat +2/+2 buff anyone can splash, with a conditional rider that pays off only if you commit to the right colors. Here the body bonus is unconditional, but first strike switches on solely while you control a white or black permanent, the two colors flanking red in the Mardu wedge. That gating carries the entire design intent. A red aggressive deck wants first strike on a fattened attacker, and the card hands it over cheaply, but only as a reward for staying inside the wedge rather than splashing the buff into an off-color build. It functions as a plain pump in mono-red and blooms into a genuine combat threat the moment a second or third wedge color hits the battlefield. Crucially, the condition checks a permanent you control, not the enchanted creature itself and not the lands underneath you: basics are colorless, so a Plains will not flip the switch. A single white or black creature, token, or other colored permanent does. As Aura design it carries the usual exposure to two-for-ones, the standard tax on any creature enchantment, which keeps the rate honest against a removal-heavy opponent.