Curator Beastie

Manifest and manifest dread both drop a card face down onto the battlefield, and by rule a face-down permanent has no color, no name, and no mana cost until it is turned up. That technicality is the whole engine. A static replacement effect reads every face-down creature as colorless and stacks two extra counters onto it before it settles, so a body that would arrive at 2/2 lands at 4/4 instead. The two triggers handle the manufacturing (one when this enters, one on every attack) while the counters supply the payoff, converting a mechanic built around cheap disposable bodies into a stream of counter-boosted threats that dig two cards deeper each swing. The colorless clause keys on the absence of a color rather than any creature type, which folds in artifact creatures, Eldrazi, and anything else your deck runs outside the color pie. That is where the effect stops being incidental and becomes a build-around. The 6/6 with reach is fine on its own for holding a board and answering fliers, but the six mana is really the price of the loop: attack, manifest dread, watch a face-down card land oversized while you sift for the next one. Counter effects that key on a permanent's color instead of its creature type are rare, and pairing one with a mechanic that reliably manufactures that colorless state on your own terms is the design's cleverest move.