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.
If the creature has toughness 0 or less, the creature dies as a state-based action.
Repeat as desired.

Reduce any number of target creatures' toughness to zero

Reduce any creature's toughness to zero when it enters the battlefield

The Ur-Dragon

Haakon, Stromgald Scourge

Morophon, the Boundless

Nameless Inversion

Declare The Ur-Dragon as an attacker.
Rafiq's first and second abilities trigger.
Resolve the first Rafiq trigger, giving The Ur-Dragon +1/+1 until end of turn.
Resolve the second Rafiq trigger, giving The Ur-Dragon double strike until end of turn.
Deal combat damage to an opponent using The Ur-Dragon, causing at least twenty-two damage to be dealt.
The opponent loses the game due to being dealt twenty-one or more damage by your commander.

Combos with "The Ur-Dragon"