Landfall — Whenever a land you control enters, any number of target players each mill X cards, where X is twice the number of Crabs, Lobsters, Nautiluses, Starfish, and/or Trilobites you control.
Psychic Corrosionmill$5.52It rewards you for repeatedly drawing or otherwise fueling a mill engine, creating a similar self-scaling mill plan in blue. While it lacks the landfall trigger, it serves the same primary function of turning game actions into opponent milling.
Ruin Crabmill$1.36This is one of the closest functional analogs: a landfall-based mill creature that scales with land drops. It is cheaper and more focused, though it mills a fixed amount rather than scaling with creature count.
Hedron Crabmill$2.65Another landfall mill creature that turns each land entry into repeated milling. It is much cheaper and narrower, but it fills the same role of landfall-driven deck depletion.
Maddening Cacophonymill$9.79This is a strong mill payoff in blue that can be used as a one-shot finisher or a scaled-up board impact with kickers. It doesn't care about creature type, but it matches the same opponent-milling game plan.
Sphinx's Tutelagemill$6.23It converts card draw into milling and can quickly snowball in a blue shell. It is a different engine, but functionally similar as a repeatable mill payoff enchantment.
Fractured Sanitymill$2.81A very efficient mill spell that can either function early or scale into a large late-game mill burst. It shares the same blue control/mill finishing role, just without the creature synergies.
Tasha's Hideous Laughtermill$3.85This is a high-impact blue mill finisher that can remove a large chunk of an opponent's library at once. It fits the same win condition role, though it uses exile-style counting rather than repeated triggers.
Fleet Swallowermill$1.28It mills a massive amount by attacking, making it a creature-based alternate win condition like Homer's milling pressure. It is slower and more combat-dependent, but it provides a comparable large-scale mill threat.