Deathmark

The split is the entire point: it destroys green or white creatures, the two colors black's permanent-based removal has historically struggled to outpace on rate, and it ignores everything else. That color restriction is what buys the single mana. Against a deck running neither color the card simply does nothing, a dead draw with no fallback mode, but pointed in the right direction the trade is brutally lopsided: one swamp for one creature, regardless of how large that creature is. This is the modern descendant of the old color-hosers, the cards built to punish specific colors rather than answer the board at large. Earlier versions of the idea leaned on clunky conditions or upkeep taxes; this one strips all of that away and leaves a clean destroy clause that only fires in two directions. The sorcery speed shapes how it plays more than the cost suggests. This is a proactive answer cast on your own turn before combat, not a trick held up to ambush an attacker, so it clears the threat on your terms rather than reacting to one. What it represents is removal that trades flexibility for raw efficiency: it gives up the universal reach of a Doom Blade-style answer and gets in return a price no flexible removal spell can touch, so long as the creature wears the right color.