Myrkul, Lord of Bones, and Astral Dragon

Prerequisites

• Myrkul, Lord of Bones on the battlefield
• Astral Dragon on the battlefield
• You have a way to cause Astral Dragon to die

Steps

1. Cause Astral Dragon to die
2. Myrkul triggers, exiling Astral Dragon and creating a token copy of it that's an enchantment and loses all other card types
3. The Astral Dragon token enters the battlefield, creating two copies of itself that are 3/3 Dragons in addition to their other types
4. The creature Astral Dragon tokens enter the battlefield, triggering their abilities
5. Resolve the first Astral Dragon trigger, creating two copies of any applicable permanent that are 3/3 Dragons in addition to their other types
6. Resolve the second Astral Dragon trigger, creating two copies of the noncreature Astral Dragon that are 3/3 Dragons in addition to their other types
7. Repeat from step 4

Results

• Infinite copies of all noncreature permanents
• Infinite creature tokens
• Infinite ETB
• Infinite LTB