Illuminor Szeras

Ashnod's Altar with a body attached and a color restriction that turns fixed colorless output into scaled black mana. The difference is the whole point: where the classic sacrifice altar pays a flat two generic mana per creature regardless of what dies, this scales its return to the sacrificed creature's mana value, so feeding it a six-drop returns six black. That reframes what the altar is for. A flat-rate outlet wants a token swarm and cheap fodder; a mana-value-scaled outlet wants expensive creatures worth converting, which pushes the deck toward reanimation loops, big bodies you can recast, and death triggers that do not care how much the corpse cost. The rate is also strictly black, so it feeds mono-color drains, X-spell payoffs, and devotion in a way the generic altars never could. What keeps it honest is the tap symbol: unlike Ashnod's Altar, this converts one creature per turn cycle unless you untap it, so the engine wants haste-adjacent enablers or untap effects rather than a free sacrifice-storm loop. Note too that it can only eat another creature, never itself, so the Necron in front of you is a beater or a chump, not fuel for its own tank. Give it a way to bring creatures back and repeatedly untap it, and it becomes a mana engine that converts recursion into black faster than most rituals can dream of.