Herald of Kozilek

Cost reducers usually key off a card type or a color: an artifact-matters discount here, a green spell that cheapens green spells there, the occasional creature that shaves the price off instants and sorceries. This one shaves a generic mana off everything colorless you cast, and the elegance is that its own Devoid keyword folds it into the crowd it rewards. Two abilities are doing separate jobs. Devoid strips this drone's own color, nothing more, so it announces itself as colorless for the sake of casting-cost triggers. The discount comes from a completely separate static line that keys off the absence of color on the cards you cast: the Eldrazi it was built alongside, the colorless ramp, the Processor payoffs, and any genuinely colorless spell all qualify without the card naming one of them. Because the reduction watches for colorlessness rather than a card type, it reaches across creatures, sorceries, and instants equally, a wider net than the spell-specific reducers it resembles. That makes the 2/4 body a fixed-rate engine, where the cleaner your colorless count, the more each subsequent cast tilts in your favor, and the toughness is durable enough to keep the discount online while the deck assembles. The two abilities rhyme without touching: the keyword that erases this drone's color describes exactly the property its static line pays out on everywhere else, which is about as structural as Devoid ever gets.