Wailing Ghoul

Mill two on entry, stapled to a frame that can wall a two-drop and buy a turn: this is the enabler doing double duty, and the toughness is where the design shows its hand. Graveyard decks want their fuel to survive the early pressure, not fold to it, so a sturdy blocker that seeds two cards is worth more to them than a fragile body that mills the same amount and dies to the first attacker. There is no payoff bolted on: no delve discount, no reanimation hook, no sacrifice trigger. It trusts whatever engine surrounds it to convert those two cards into value, and it asks only that you have a reason to want cards in the yard at all. That restraint is deliberate, and it places this at the workhorse end of the self-mill lineage: cheap, dependable, and entirely reliant on the deck built to use it. It does one small thing, it does it on the cheapest sturdy chassis available, and it leaves the actual graveyard payoff to somebody else.