How can you create a combo with River Song, Radiant Performer, Field of Ruin?
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[START OF COMBO]This combo can be formed with River Song, Radiant Performer, Field of Ruin

Color identity: UR
Mana cost: {5}{R}{R}
Steps:
  1. Activate Field of Ruin's second ability by paying {2}, tapping and sacrificing it, targeting any nonbasic land an opponent controls.
  2. Holding priority, cast Radiant Performer by paying {3}{R}{R}.
  3. When Radiant Performer enters the battlefield, it triggers, copying Field of Ruin's ability for each other nonbasic land your opponents control.
  4. Resolve the first Field of Ruin ability, destroying the land it it targeting, then causing each player to search their library for a basic land card and put it onto the battlefield.
  5. River Song triggers for each opponent who searches this way.
  6. Resolve the first trigger, putting a +1/+1 counter on it and dealing damage equal to its power to an opponent.
  7. Repeat step 6 for each other trigger.
  8. Repeat from step 4 for each other Field of Ruin ability.[END OF COMBO STEPS]

Result:
  - Near-infinite damage[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - An opponent controls at least one nonbasic land.
[END OF COMBO PREREQUISITES]
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