Goblin Swine-Rider

A trap dressed as a one-drop. The body is a 1/1, the cost is a single red, and the entire design lives inside that "becomes blocked" trigger: a punishment aimed not at the controller but at whoever steps in front of it. Blocking the Swine-Rider costs the defender 2 damage on every creature involved in the combat, which means a single chump-block can wipe out a board of small attackers and blockers alike, the Swine-Rider included. The constraint that makes the effect work is that it only fires when blocked, so the card has no value as a pure attacker against an empty board and no defensive use at all; it is a dare. Either the opponent eats a 1-power swing every turn or they trigger a symmetrical blowout they have to navigate carefully. That symmetry is the friction: the 2 damage hits attacking creatures too, so a wide red board cannot just throw the Rider in front of a blocker without thinning its own side. It belongs to an old lineage of "punisher" creatures that turn the act of blocking into a tax, the same structural idea later cards would refine with first strike, deathtouch, or one-sided wording. The Swine-Rider is the blunt early version: cheap, symmetrical, and entirely dependent on an opponent making the obvious play.