Miirym, Sentinel Wyrm, Cloudstone Curio, Slumbering Dragon, and Birgi, God of Storytelling // Harnfel, Horn of Bounty

Prerequisites

• Miirym, Sentinel Wyrm on the battlefield
• Cloudstone Curio on the battlefield
• Slumbering Dragon in hand
• Birgi, God of Storytelling // Harnfel, Horn of Bounty on the battlefield
• available

Steps

1. Cast Slumbering Dragon by paying
2. Birgi triggers, adding
3. Slumbering Dragon enters the battlefield, triggering Cloudstone Curio and Miirym
4. Resolve the Cloudstone Curio trigger, choosing not to return anything to your hand from the battlefield
5. Resolve the Miirym trigger, creating a token copy of Slumbering Dragon
6. The Slumbering Dragon token enters the battlefield, triggering Cloudstone Curio, returning the nontoken Slumbering Dragon from the battlefield to your hand
7. Repeat

Results

• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count