Wandering Tombshell
Six toughness on a power-one body is the entire proposition: this is a wall built to blunt ground offenses, not to join them. There is no oracle text doing extra work, which makes it an unusually pure expression of the defensive creature: durability offered without a payoff stapled on. The 6 is the number that earns its keep, surviving the bulk of midrange attackers and most spot damage of its era, while the 1 power means it threatens nothing and asks nothing in return. Black rarely receives a blocker this sticky; most of its creatures are trading pieces, sacrifice fodder, or drain engines, and a body that simply refuses to die on the ground sits slightly outside the color's usual toolkit. The absence of any rider is itself the design statement. It suits a deck content to win elsewhere while this Zombie Turtle absorbs the early beats, a placeholder that buys turns rather than generates value. As raw rate it is modest; as a wall in a color short on them, it is exactly what it appears to be, and it makes the ground a bad place to attack.
