Activate Scion of the Ur-Dragon twice by paying {4}.
Resolve the first ability, searching your library for Colossal Grave-Reaver and putting it into your graveyard, and then causing Scion of the Ur-Dragon to become a copy of Colossal Grave-Reaver until end of turn.
Resolve the second ability, searching your library for Bladewing and putting it into your graveyard, and then causing Scion of the Ur-Dragon to become a copy of Bladewing until end of turn.
Because Scion of the Ur-Dragon was a copy of Colossal Grave-Reaver when Bladewing was put into your graveyard, it will trigger, returning Bladewing from your graveyard to the battlefield.
Put Bladewing into your graveyard due to the legend rule.
Bladewing triggers, returning itself from your graveyard to the battlefield.
Repeat from step 5.

Infinite creature ETB

Infinite creature LTB

Infinite death triggers

Scion of the Ur-Dragon

Colossal Grave-Reaver

Bladewing the Risen

Activate Scion of the Ur-Dragon by paying {2}.
Holding priority, activate Scion of the Ur-Dragon a second time by paying {2}.
Resolve the first Scion of the Ur-Dragon ability, searching your library for Moltensteel Dragon, putting it into your graveyard, causing Scion of the Ur-Dragon to become a copy of Moltensteel Dragon until end of turn, and shuffling your library.
Activate Scion of the Ur-Dragon by paying {R/P}, giving itself +1/+0 until end of turn.
Repeat step 4 five additional times.
Resolve the Scion of the Ur-Dragon ability from step 1, searching your library for Skithiryx, putting it into your graveyard, causing Scion of the Ur-Dragon to become a copy of Skithiryx until end of turn, and shuffling your library.
If Scion of the Ur-Dragon has summoning sickness, activate it by paying {B}, giving it haste until end of turn.
Deal combat damage with Scion of the Ur-Dragon, causing an opponent to get ten poison counters and lose the game due to lethal infect damage.

Target opponent loses the game

Skithiryx, the Blight Dragon

Moltensteel Dragon

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 the toughness of creatures opponents control to 0

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

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.

Rafiq of the Many

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