Haakon, Stromgald Scourge + Morophon, the Boundless + Nameless Inversion + Semblance Anvil

Haakon, Stromgald Scourge

Morophon, the Boundless

Nameless Inversion

Semblance Anvil

How it works

1. Cast Nameless Inversion from your graveyard, as it is a Knight card, by paying 0 due to Semblance Anvil and Morophon, giving a creature +3/-3 until end of turn.
2. If the creature has toughness 0 or less, the creature dies as a state-based action.
3. Repeat as desired.

This clever loop transforms a humble typal removal spell into a repeating engine by leveraging Haakon, Stromgald Scourge's ability to let you cast Knight spells directly from your graveyard. Thanks to Morophon, the Boundless naming "Knight" and Semblance Anvil having an instant exiled to it, Nameless Inversion's mana cost is completely discounted to zero—remember, Nameless Inversion's changeling ability makes it a Knight, and Semblance Anvil shares its instant card type with your imprinted spell. Because Haakon allows you to cast that freshly resolved Nameless Inversion right back out of your graveyard, you can repeatedly shred opposing creatures' toughness down to zero without ever running out of ammo.