Greater Harvester

The cruelty is in the order of operations. You pay before you profit: every upkeep this thing sits on the board, you sacrifice a permanent of your own, and nothing comes back until it connects. Then the math inverts. One swing and the opponent gives up two permanents of their choice, so the rate you bleed at is half the rate you make them bleed, but only while the beats keep landing. String the hits together and you hollow a board out faster than most attrition plans can rebuild, with a 5/6 body that sits above the reach of most combat removal. Stall the clock and you are the one feeding the maw for free. Black has always asked for a price before it points at the opponent, and this design wears that bargain on its sleeve: take from yourself first, take from them later, and the contract dissolves the moment the damage stops. The real question is what you feed it. A spent enchantment, a token you were going to lose anyway, an excess land, or a sacrifice shell where the forced upkeep give-up becomes its own death trigger rather than a loss: in that frame the upkeep cost stops being a tax and turns into a fixed engine input you were already paying. Built as a lone beater, the drawback bleeds you out. Built around, the drawback is the on-ramp.