Prince of Thralls

Eight mana across three colors is the loyalty premium, and the 7/7 body is the least interesting thing about it. The real engine is a tax on the act of losing permanents: whenever something an opponent controls hits the battlefield's exit, they either bleed three life or watch it reappear under your control. The trigger fires on the broadest qualifying event the wording allows: a creature dying in combat, a permanent sacrificed to its own ability, an artifact destroyed, a land cracked for fetching, anything an opponent controls going from battlefield to graveyard. The control distinction is sharper than it looks: it does not matter who owns the permanent, only who governs it when it leaves, so a creature you loaned away and an opponent's own board are equally fair game. Note the other boundary too: it catches only permanents leaving the battlefield, so cards milled off the library and instants or sorceries resolving into the bin do nothing here. What it does catch, it catches punitively. A board wipe that clears your opponent's side donates that whole side to you, three life at a time, and life is exactly the resource a wrath rarely leaves in surplus. The three-life ransom is the relief valve that stops it short of an outright lock, but it is a valve the opponent has to keep paying, every loss, every turn. This is the demon as a standing decree rather than a single haymaker: not one overwhelming swing, but a tax on the most ordinary interactions in the game.