Haakon, Stromgald Scourge, Morophon, the Boundless, Nameless Inversion, and Archmage of Runes

Prerequisites

• Haakon, Stromgald Scourge on the battlefield
• Morophon, the Boundless on the battlefield
• Nameless Inversion in hand or in the graveyard
• Archmage of Runes on the battlefield

Steps

1. Cast Nameless Inversion from your graveyard, as it is a Knight card, by paying due to Archmage of Runes 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

Results

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