Calamitous Cave-In

A board sweeper whose damage output isn't fixed by the mana you spend but by a resource you accumulate: every Cave you control and every Cave sitting in your graveyard adds one to X. That gives the card a scaling curve most red wraths refuse it. Traditional red sweepers pick a number and live with it: too small against a developed board, dead against anything larger. Here the ceiling rises as a game grinds on, because Caves are lands you were playing anyway and lands that die, get sacrificed, or get cycled all keep counting from the yard. The design turns land destruction and land attrition into stored sweeper fuel, which is an unusual axis for a red board wipe to reward. The tension is that the payoff lives entirely in the deck around it: run four or five Caves and this is a mediocre two-or-three damage sorcery; build a manabase that leans on Caves and salts the graveyard with more, and it becomes a scalable answer that also clears planeswalkers, something red rarely gets to do cleanly. It asks you to treat your lands as a countable subtheme rather than as fixing, and it pays proportionally to how seriously you take that ask.