Ruthless Winnower
A symmetrical sacrifice that stops being symmetrical the moment you read the creature type on the card. Grave Pact and its cousins tax opponents whenever your own creatures die; this one runs on the clock instead, forcing every player, including its controller, to feed it a creature at the start of each upkeep. The escape hatch is written into the text: non-Elf. Flood your board with Elves and the tax lands everywhere but on your own commitments, which quietly reframes an ordinary tribal deck as a grinding attrition engine. The design worth studying is the exemption clause, not the sacrifice. A repeating edict like this is already a soft prison for any player relying on a single big threat, since they have to feed exactly that threat each upkeep; go-wide boards shrug off one loss per turn. What the Elf rider changes is which side of that math the controller sits on. By making every one of your relevant bodies immune, it turns a generically annoying edict into an asymmetric attrition tax: the whole table bleeds a creature a turn while you pay nothing, provided you keep the board a monoculture. The tribal restriction is doing double duty here: it is both the payoff for building around it and the release valve that keeps the effect from strangling its own controller, and it asks for the specific kind of deck that can keep a wide, single-typed population on the table.
