Haakon, Stromgald Scourge + Morophon, the Boundless + Nameless Inversion + Mana Matrix

Haakon, Stromgald Scourge

Morophon, the Boundless

Nameless Inversion

Mana Matrix

How it works

1. Cast Nameless Inversion from your graveyard, as it is a Knight card, by paying 0 due to Mana Matrix 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 engine turns a humble removal spell into an endless, self-sustaining loop by exploiting type-changing interactions and graveyard casting rules. Morophon, the Boundless acts as the cornerstone by naming Knights and shaving a massive amount of colored mana off your spells, while Mana Matrix chips away the remaining generic mana cost to reduce Nameless Inversion's total price down to zero. Because Nameless Inversion is a Changeling, it counts as a Knight, allowing Haakon, Stromgald Scourge to pull it straight out of your graveyard time and time again. You can thus cast Nameless Inversion infinitely from your graveyard to whittle away at opposing creatures until their toughness hits zero, entirely bypassing normal resource limitations.