Prizefighter Construct

Six power for five colorless mana with two toughness underneath it: the entire proposition lives in that split. This is the generically castable beater that feeds the top of an artifact-themed curve, a "big number" designers can hand out without handing out anything dangerous. The glass-cannon build is the balancing act. Give it three or four toughness and it becomes a threat that demands an answer; leave it at two and it stays honest, folding to any two-power blocker willing to trade or any burn spell that clears the bar, so the six power only converts to damage while the board stays clear. The colorless cost is doing the same work the body is: it slots anywhere an artifact count needs feeding without asking the deck to commit to a color, which is exactly why it reads as filler rather than a threat. There is a long line of these constructs, the ones whose only text is their power, and they all answer the same structural need: a high-end body that contributes to an artifact-matters payoff and stops earning its slot the instant a card with an actual ability shows up. Outside that narrow role it asks too much for too little, a beater whose ceiling is the number left of the slash and whose floor is whatever your opponent keeps back to block it.