Haakon, Stromgald Scourge + Morophon, the Boundless + Nameless Inversion + Stone Calendar

WUBRG identity

Commander legal

The 4 combo pieces

• Haakon, Stromgald Scourge
• Morophon, the Boundless
• Nameless Inversion
• Stone Calendar

How to execute it

1. Cast Nameless Inversion from your graveyard, as it is a Knight card, by paying {0} due to Stone Calendar 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.

What the combo produces

• Reduce the toughness of creatures opponents control to 0
• Reduce the toughness of each creature opponents control to 0 upon entering