Gnottvold Slumbermound

Land destruction has always been the effect designers keep at arm's length, so when it comes stapled to a mana source it comes at a steep toll: this taps for red, enters tapped, and only becomes a wrecking ball once you feed it six mana in a specific Gruul commitment and give up the land itself. The economics are the whole point. You are trading a colored source and a chunk of a turn to blow up an opponent's land and leave a 4/4 trample body behind, which reframes the effect from pure disruption into a tempo swing that replaces itself with a threat. That Troll Warrior is the difference between this and the older single-purpose land-hate lands: destroying a land is card disadvantage on both sides, but walking away with a creature turns the exchange into something closer to even. The tapped-land drawback and the heavy activation cost are the guardrails keeping the effect out of aggressive decks that would abuse cheap Stone Rain effects; by the time you can afford the sacrifice ability, the game has usually moved past the window where a single destroyed land is backbreaking. It is a slow, grindy piece of interaction dressed as a utility land, built for the kind of deck that wants a late-game mana sink attached to its manabase rather than a dedicated disruption spell.