Dance of Many, and Felidar Guardian

Prerequisites

• Dance of Many in hand
• Felidar Guardian on the battlefield
• undefined available

Steps

1. Cast Dance of Many by paying
2. When Dance of Many enters the battlefield, its first ability triggers, creating a token copy of Felidar Guardian
3. When the Felidar Guardian token enters the battlefield, it triggers, blinking Dance of Many
4. Dance of Many's first and second abilities trigger
5. Resolve the second trigger, exiling the Felidar Guardian token
6. Resolve the first trigger, creating a token copy of Felidar Guardian
7. Repeat from step 3

Results

• Infinite LTB
• Infinite ETB