Haakon, Stromgald Scourge, Morophon, the Boundless, Nameless Inversion, and Storm-Kiln Artist

Prerequisites

• Haakon, Stromgald Scourge on the battlefield
• Morophon, the Boundless on the battlefield
• Nameless Inversion in hand or in the graveyard
• Storm-Kiln Artist on the battlefield
• available

Steps

1. Cast Nameless Inversion from your graveyard, as it is a Knight card, by paying due to Morophon
2. Storm-Kiln Artist triggers, creating a Treasure token
3. Resolve Nameless Inversion, giving a creature +3/-3 until end of turn
4. If the creature has toughness 0 or less, the creature dies as a state-based action
5. Activate the Treasure by tapping and sacrificing it, adding
6. Repeat as desired

Results

• Reduce any number of target creatures' toughness to zero
• Reduce any creature's toughness to zero when it enters the battlefield