Initiates of the Ebon Hand

Filter generic mana into black at a one-for-one rate without ever tapping, and a 1/1 Cleric will keep doing it as many times as you can pay. The body is incidental; the card is a question about how much black mana a single turn is worth, and its answer is unbounded, provided you accept the cost. Cross four activations in a turn and the Cleric agrees to die when that turn winds down. The penalty is not a ceiling on output but a tax on the creature's survival: you can convert as much generic as you have to spend, and the only thing it costs is the filter itself. The timing of that bargain is where the real design lives. The sacrifice is deferred to the next end step rather than triggered the moment you cross the threshold, so the Cleric sticks around through your fourth activation: free to chump a blocker, feed a sacrifice outlet for value, or carry an aura you no longer mind losing before the bill comes due. The shape reflects a design instinct to put mana abilities on creatures rather than artifacts or lands, trading a small body's combat relevance for color correction. The answer it offers is that you can have all the black mana one turn can hold, provided you are willing to bury the thing that gave it to you.