Sedris, the Traitor King

Unearth was a graveyard keyword scoped to a single creature at a time, baked into each card that carried it: pay the cost, return it for one swing, exile it at end of turn. Sedris takes that one-shot clause and stamps it onto every creature card in your graveyard at once, at a fixed price the king sets for all of them. That conversion is the design idea worth sitting with. A keyword built as a small recursion rider on a handful of commons becomes a repeatable reanimation engine that does not care what put the creature in the yard or whether it ever printed unearth itself. The exile-at-end-of-step clause that balanced the original keyword stays intact, so each return is rented rather than owned, and the manner of that exile matters: because the body is exiled instead of dying, you get the enters-the-battlefield trigger and a hasty attacker, but no death trigger fires. What you are buying is an arrival and a swing, then a clean exile at end of step that denies any wrath or spot removal the death trigger it would otherwise hand you. That turns a graveyard full of value creatures into a sequence of one-turn detonations rather than a board you have to defend. The 5/5 closes games on its own, but the engine is the reason to assemble around it: a Grixis pile that wants its best creatures dead, not on the battlefield, and a king who profits from every one of them.