Calamitous Cave-In

In Commander, Calamitous Cave-In earns a slot in any red deck that needs a free answer to go-wide boards or problematic planeswalkers — the zero-mana floor means you can hold interaction without tapping out. In Modern and Legacy, three damage to everything is rarely enough to close the loop on larger threats, so it occupies a narrow role as a surprise sweeper in red-heavy aggro or storm shells where free spells have structural value. Pioneer and Standard slow the format down enough that three damage catches most early creatures, making this a legitimate sideboard option against token strategies. Across competitive formats, the pitch cost — discarding a red card — is real, and the card rewards dense red hands over splash builds.