Myrkul, Lord of Bones, Ondu Spiritdancer, and Archon of Sun's Grace

Prerequisites

• Myrkul, Lord of Bones on the battlefield
• Ondu Spiritdancer on the battlefield
• Archon of Sun's Grace on the battlefield
• You have a way to kill Ondu Spiritdancer

Steps

1. Kill Ondu Spiritdancer
2. Myrkul triggers, creating a token copy of Ondu Spiritdancer that is an enchantment
3. When the token Ondu Spiridancer enters the battlefield, it and Archon of Sun's Grace trigger
4. Resolve the Archon of Sun's Grace trigger, creating a 2/2 Pegasus creature token
5. Resolve the Ondu Spiritdancer trigger, creating a token copy of itself
6. Repeat from step 3

Results

• Infinite creature tokens
• Infinite ETB
• Infinite Ondu Spiritdancer tokens that are enchantments