How can you create a combo with Scion of the Ur-Dragon, Skithiryx, the Blight Dragon, Moltensteel Dragon?
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[START OF COMBO]This combo can be formed with Scion of the Ur-Dragon, Skithiryx, the Blight Dragon, Moltensteel Dragon

Color identity: WUBRG
Mana cost: {4}{R/P}{R/P}{R/P}{R/P}{R/P}{R/P}, plus an additional {B} if Scion of the Ur-Dragon has summoning sickness
Steps:
  1. Activate Scion of the Ur-Dragon by paying {2}.
  2. Holding priority, activate Scion of the Ur-Dragon a second time by paying {2}.
  3. 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.
  4. Activate Scion of the Ur-Dragon by paying {R/P}, giving itself +1/+0 until end of turn.
  5. Repeat step 4 five additional times.
  6. 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.
  7. If Scion of the Ur-Dragon has summoning sickness, activate it by paying {B}, giving it haste until end of turn.
  8. 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.[END OF COMBO STEPS]

Result:
  - Target opponent loses the game[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Scion of the Ur-Dragon must be on the battlefield
  - Skithiryx, the Blight Dragon must be in the library
  - Moltensteel Dragon must be in the library
  - An opponent is unable to block and kill Scion of the Ur-Dragon.
[END OF COMBO PREREQUISITES]
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