Guardians of Meletis

Six toughness on a colorless body is the entire proposition: a wall that ignores your color commitments and stops nearly everything the early turns can throw at it. The 0 power is the price of admission. This is a pure blocker, no incidental card, no keyword rider, no late-game pivot that converts the defense into pressure. It exists to buy turns, and it buys a lot of them, the kind of speed bump a control or combo shell slots in regardless of color because the artifact type places no demand on the manabase. The lineage runs through Wall of Omens and Wall of Denial and every other big-butt stall piece, but those come with a reason to run them beyond the wall itself: a card drawn, an evasion-proof keyword, some second function. Strip all of that away and what remains is the most austere version of the effect, a body priced to soak up small creatures and burn while contributing nothing else. That austerity is both the design and its ceiling. A defender whose only text is Defender lives or dies on whether six toughness at three mana is enough wall for the room, and a wall that does exactly one thing folds to any deck built to go over or around it.