Saberclaw Golem

Five generic mana for a 4/2 is a deliberately poor rate, and the repeatable first strike is the whole reason to pay it. One red turns a fragile, oversized body into an attacker that wins combat math it has no business winning: it survives blocks from anything smaller while still trading up into larger threats, and it punishes the defender who tries to gang-block or chump with a single creature expecting a clean exchange. The toughness of 2 is the leash that keeps it fair, since cheap removal or even a modest blocker answers it the moment the red mana isn't available; but as long as you can switch the ability on, it refuses to die against its equals in combat. Because the casting cost is generic rather than red, the card asks only for a single red source to function, a concession that lets it ride in builds with the lightest of splashes rather than full commitment. It belongs to a long line of colorless creatures built around one repeatable combat trick: not a card to construct a strategy around, but reliable pressure that makes attacking math frustrating for the player on defense. The price tag is the honest signal: this is what you pay for a beater that walks into combat and walks back out.