Scion of the Wild

Its body is a referendum on board presence: deploy it into an empty battlefield and it arrives as a 1/1, since it counts itself, and deploy it after a few token producers or a swarm of mana dorks and it grows past anything its color usually fields for the price. That makes it a payoff dressed as a creature. The design slots cleanly into go-wide green, where the count it cares about is the same count every Overrun-style finisher and convoke enabler also wants, and it scales alongside your other creatures instead of asking for support of its own. The count runs live in both directions: as the bodies around it leave, the Scion shrinks in the same breath, never below 1/1 but never any larger than the swarm it leads. A board wipe does not spare it either; it dies alongside everything else it was counting. There is no static floor worth leaning on and no counter to remember; the power and toughness are recomputed continuously, so it is at its strongest when you are already winning and at its most fragile precisely when you most want a blocker. Green has printed plenty of creatures whose size keys off the battlefield in the years since, but this one keeps the arithmetic at its purest: it is exactly as big as your board, itself included, and not one point bigger.