Living Wall

A Wall from the original artifact toolbox, built when the wall-as-blocker was still being calibrated as a creature type rather than a defensive keyword. The body is the pitch: a 0/6 for four generic mana, with a cheap regenerate stapled on so that combat and the destruction-based removal of the era could not move it. Regeneration in 1993 was the catch-all "doesn't die" mechanic that predated indestructible, and bolting it to a colorless wall meant any deck could buy a recursive ground stop without splashing green or white. The design choice worth dwelling on is what regeneration actually replaces: destruction, not damage. A plain destroy effect resolves and accomplishes nothing while the controller holds one mana open, and the amount of damage dealt is irrelevant because the regeneration shield removes all marked damage from the creature regardless of size. There is no "overwhelming" it with a big hit; you clear it by attacking the mechanic itself. That means a "can't be regenerated" clause, exile, sacrifice effects, bounce, or simply waiting for the controller to tap out. Read against a contemporary like Wall of Stone (0/8 for a comparable cost), the trade is legible: two points of toughness given up for colorless castability and a regeneration loop that makes the wall functionally permanent against single answers. The rate is soft by modern eyes, but the structural job is clean: a self-sufficient blocker that forces the opponent to spend more than one card, or one specific card, to be rid of it.