Ancient Adamantoise

That 20-point toughness is not a body, it is a redirect valve. The line that keeps damage from clearing during cleanup means each hit stacks permanently across turns, so this thing is functionally a bank that fills up rather than a wall that resets: the twenty is a ceiling you climb toward, not a buffer that refreshes. Bolt it to the fog of "all damage to you and your other permanents comes here instead" and you have a single object soaking every attack, every burn spell, every board wipe's ping that would otherwise be spread across your life total and your battlefield. The design tension is deliberate. Its toughness is enormous but finite, and because the damage persists, the shell is racing a clock the opponent gets to set. When it finally cracks, the death trigger pays out ten tapped Treasure: not a mana burst you can spend the turn it dies, but a next-turn windfall that turns the sacrifice of your fortress into the fuel for whatever ends the game. This is a defensive centerpiece built to fail productively, which is a rarer thing to design than it sounds. Most damage sponges either survive or they don't; this one is engineered around the assumption that it eventually won't, and it makes the collapse the point. Ward keeps it from being removed cheaply before it has done any absorbing, closing the obvious out of just answering the redirect at its source.