Bag End Porter

A payoff dressed as a beater. The 4/4 body for four mana is deliberately plain; the card's purpose is to reward a board built on legendary creatures, scaling its own attack step by however many you control. That framing makes it a green enabler for a deckbuilding constraint green rarely gets to lean on, since the legend-matters payoffs tend to cluster in white and multicolor. The trigger fires only on the attack, so the pump is offense-only: no blocking bonus, no defensive value, and if the board gets swept before you swing, the Porter attacks as a plain 4/4. The bonus lands on the Porter alone, not the rest of your team, which keeps the effect self-contained: a single threat that grows with your legend count rather than a lord that hands the buff around. It counts legendary creatures specifically, so a legendary land or a lone planeswalker does nothing for the math; what moves the number is bodies, whether a commander or the assorted legends a green midrange shell can already field. Load the board with them and it becomes a real clock that grows with every legend you deploy; run it in an ordinary creature deck and it just sits there. The design bet is that "count your legendary creatures" is a build-around worth chasing, and the Porter is the low-color-commitment on-ramp: cheap enough to curve into, green enough to slot alongside ramp and fixing, and scaling hard enough to matter once the count climbs.