How can you create a combo with Mythos of Illuna, Radiate, Metallurgic Summonings?
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[START OF COMBO]This combo can be formed with Mythos of Illuna, Radiate, Metallurgic Summonings

Color identity: GUR
Mana cost: {5}{U}{U}{R}{R}
Steps:
  1. Cast Mythos of Illuna by paying {2}{U}{U}, targeting anything but Metallurgic Summonings.
  2. In response, cast Radiate by paying {3}{R}{R}.
  3. Metallurgic Summonings triggers, creating a 5/5 Construct artifact creature token.
  4. Resolve Radiate, creating copies of Mythos of Illuna that target each permanent besides the original target.
  5. Resolve all copies of Mythos of Illuna besides the original, creating token copies of each permanent besides the original target, bringing the total number of artifacts you control to at least six.
  6. Activate any copy of Metallurgic Summonings by paying {3}{U}{U}, returning all instant and sorcery cards from your graveyard to your hand.
  7. Activate the token lands or other mana-producing permanents created in step 3 by tapping them, adding at least {6}{U}{U}{R}{R}.
  8. Repeat from step 2, doubling the number of copies created in step 4 each repetition.[END OF COMBO STEPS]

Result:
  - Infinite copies of all permanents
  - Infinite creature tokens
  - Infinite magecraft triggers
  - Infinite mana permanents on the battlefield can produce
  - Infinite storm count
  - Return all instant and sorcery cards from your graveyard to your hand[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Mythos of Illuna must be in your hand
  - Radiate must be in your hand
  - Metallurgic Summonings must be on the battlefield
  - There are permanents on the battlefield that enter the battlefield untapped and produce at least {6}{U}{U}{R}{R}.
  - You control at least two artifacts, reduced by one for every two artifacts controlled by opponents.
[END OF COMBO PREREQUISITES]
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