Fortress Cyclops
The printed body is a polite fiction; the creature never fights at its stated size. Read as a vanilla 3/3 for five, it would be a non-starter, but the attack-and-block triggers mean it swings as a 6/3 and holds the line as a 3/6, so the same card reads as a real threat on offense and a wall on defense without ever spending another resource. That split is the whole design idea, and it points at the kind of combat-first player red-white midrange was built around: someone who wants the math already tilted their way no matter which side of it they end up on. The catch is that the pumps are reactive and welded to the combat step, so the body does nothing against removal and nothing until swords are actually crossed. The toughness half is the more interesting one, because a 3/3 that balloons to 3/6 the moment it blocks rewrites attack decisions across the board: even before combat, an opponent has to reckon with a defender that trades up rather than down, so they need a threat big enough to beat six toughness (or a burn spell to finish it) before an attack is worth declaring. Most aggressive curves are not built to punch through that profitably. A clean, slightly underpowered statement of what this era's Boros decks wanted to be: never caught flat-footed in combat, on either side of it.
