The Ur-Dragon
Haakon, Stromgald Scourge
Morophon, the Boundless
Nameless Inversion

   Prerequisites

What do I need to start this combo?
The Ur-Dragon on the battlefield or in the command zone.
Nameless Inversion in hand or in your graveyard.
Haakon and Morophon on the battlefield.

   Steps

How does this combo work?
1
Cast Nameless Inversion from your graveyard, as it is a Knight card, by paying 0 due to The Ur-Dragon 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

What do I get from this combo?
Reduce the toughness of creatures opponents control to 0
Reduce the toughness of each creature opponents control to 0 upon entering
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