Field of Ruin, Radiant Performer, and River Song

Prerequisites

• Field of Ruin on the battlefield
• Radiant Performer on the battlefield
• River Song on the battlefield
• An opponent controls at least one nonbasic land
• available

Steps

1. Activate Field of Ruin's second ability by paying , tapping and sacrificing it, targeting any nonbasic land an opponent controls
2. Holding priority, cast Radiant Performer by paying
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

Results

• Near-infinite damage