Bloodletter of Aclazotz

Life loss doublers usually live in the enchantment slot, static and defenseless: something you assemble around and hope survives. Putting the effect on a flying body changes the whole proposition. The multiplier is now a clock in its own right, a 2/4 that pressures the air while it doubles everything else you point at the opponent. Every drain trigger, every attack that connects, every incidental damage source your turn produces gets run through the same amplifier, and because the parenthetical explicitly folds combat damage into the math, the creature effectively swings for four on its own turn while making the rest of the board hit twice as hard. The restriction that keeps it from being a symmetrical horror is the "during your turn" clause: it does nothing on the opponent's turn, so you cannot use it to punish the fetch lands or painful choices they make on their own turn. That confines the payoff to setups where you are the one dictating tempo, which is precisely the aggressive, forward-leaning shell black drain strategies want anyway. Where older doublers asked you to protect a fragile piece and then find the payoff, this one is the payoff and the body in a single card, and the triple-black cost is the honest tax on stapling a game-ending multiplier to an evasive attacker.