Kadena, Slinking Sorcerer

Morph spent most of its life as a hidden mechanic in search of a payoff. The face-down 2/2 was a bluff and a mana sink, but nothing rewarded the act of playing creatures under a shell for its own sake; you flipped them because the creature underneath was good, not because the shell was. This design inverts that priority. Knocking three off the first face-down creature spell you cast each turn turns the morph tax into a discount, and drawing a card whenever a face-down creature enters makes the shell itself the payoff regardless of what is hiding inside. The color identity is the tell: Sultai gathers the two colors that hold most of the historical face-down creatures alongside the blue that has always wanted extra cards, so the deck it asks for is not a morph tribal curiosity but a card-advantage engine that happens to speak in disguises. The subtlety worth noting is where the two abilities part company. The discount is worded "the first face-down creature spell you cast," so it rewards hardcasting face-down creatures and nothing else; manifest puts a card onto the battlefield without casting it and gets no price break. The draw, by contrast, keys on "enters," which is wider: any face-down creature you control arriving on the battlefield feeds it, so manifest triggers the card just as reliably as a hardcast morph does, even though it never touched the discount. That split is the design's real cleverness: two abilities aimed at the same disguise, entering the game through different doors.