Myrkul, Lord of Bones, Ondu Spiritdancer, and Underworld Coinsmith

Prerequisites

• Myrkul, Lord of Bones on the battlefield
• Ondu Spiritdancer on the battlefield
• Underworld Coinsmith 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 Underworld Coinsmith trigger
4. Resolve the Underworld Coinsmith trigger, causing you to gain 1 life
5. Resolve the Ondu Spiritdancer trigger, creating a token copy of itself
6. Repeat from step 3

Results

• Infinite lifegain
• Infinite lifegain triggers
• Infinite Ondu Spiritdancer tokens that are enchantments