Rakdos Joins Up, Starfield of Nyx, and Deepfathom Echo

Prerequisites

• Rakdos Joins Up on the battlefield
• Starfield of Nyx on the battlefield
• Deepfathom Echo on the battlefield

Steps

1. Cast Deepfathom Echo by paying its mana cost
2. Choose to have it enter the battlefield as a copy of Rakdos Joins Up
3. Put Deepfathom Echo into your graveyard due to the legend rule
4. Deepfathom Echo's first ability and second ability trigger, along with Rakdos Joins Up's second ability
5. Resolve Deepfathom Echo's second trigger and Rakdos Joins Up's trigger, dealing damage to target opponent
6. Resolve Deepfathom Echo's first trigger, returning it from your graveyard to the battlefield with two +1/+1 counters on it as a copy of Rakdos Joins Up
7. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite death triggers
• Infinite damage