Caelorna, Coral Tyrant

Eight toughness for two mana, and nothing else: no keyword, no activated ability, no death trigger, just a body that soaks damage and refuses to fall over. The 0 power is the whole point. A creature with power can be a clock, and a clock invites the opponent to race or trade into it; strip the power to zero and the card stops threatening anything at all, which frees it to be pure infrastructure. It exists to eat an entire early aggressive curve and keep standing, blank after blank, until the game shifts to a plane where the opponent's attackers no longer matter. What makes the vanilla line interesting rather than dull is the arithmetic of removal against it: an eight-toughness wall shrugs off nearly every efficient burn spell and most single-shot removal, so the answers that do work are the expensive, unconditional ones. The opponent either spends a premium card to move a two-drop or leaves the wall in place and plays around it. A legendary body with these numbers is built to make cheap interaction feel wasted and combat math tedious, which is exactly the frustration a defensive deck wants to impose. It never wins the game by itself, and it is not supposed to; it buys the turns for whatever does.