Goblin Digging Team

One mana buys a Goblin whose only trick is to detonate itself against a Wall, and nothing else. There is no fallback mode, no body left to attack with after it sacrifices itself, no flexibility if the opponent simply never plays one. The narrowness is total: it documents a moment when red's hatred of defensive structures got its own dedicated one-drop instead of being folded into a flexible removal spell. Walls were a real if minor presence in early Magic (defensive blockers in the vein of Wall of Wood or Wall of Stone), and someone decided they warranted a purpose-built assassin priced to demolish exactly one creature subtype. Goblins-as-demolition-crew is good flavor, and the art sells the sapper conceit, but as design it is a footnote about how literally the color pie was once translated into cards. It is functionally a sideboard answer dressed up as a maindeck creature, printed before sideboard theory was formalized and before designers grasped that an answer this specific would sit dead in nearly every game. What it preserves is the contrast: the distance between an answer built for a single creature subtype and the flexible, fail-safe removal that came after.