Roshan, Hidden Magister

Two mechanics that rarely share a card get welded together here. The first is a type-line rewrite that turns your whole board, your creature spells, and even the creatures in your library and graveyard into Assassins: a lord effect that grants tribe rather than stats, retroactively making an Assassin theme viable out of creatures that were never printed as one. The second is a genuine face-down payoff engine, and the join between the two is where the design gets sharp. Granting menace to your face-down creatures does the obvious job of pushing morph and disguise bodies through blockers, but the real reward is on the flip: every permanent you turn face up draws a card and costs a life. That converts the manifest-and-disguise subgame from a bluffing exercise into a card-advantage machine, where each unmasking is a cantrip stapled to a body reveal. The life loss is the counterweight that keeps the draw from being free, a slow Phyrexian Arena rate paid in unmorph triggers rather than upkeeps. The tension worth noting is that the two halves want different things: the Assassin-lord clause rewards going wide with a tribe, while the face-up engine rewards a deck stuffed with morph, disguise, and manifest effects, and a single card sitting at the intersection is asking you to pick which axis to build toward.