Cavalier of Dawn, Infinite Reflection, March of the Machines, and Cathar's Shield

Prerequisites

• Cavalier of Dawn on the battlefield
• Infinite Reflection on the battlefield
• March of the Machines on the battlefield
• Cathar's Shield in hand
• Infinite Reflection attached to Cavalier of Dawn

Steps

1. Cast Cathar's Shield by paying
2. Cathar's Shield enters the battlefield as a copy of Cavalier of Dawn
3. Copy of Cavalier of Dawn enter-the-battlefield ability triggers, destroying itself and creating you a 3/3 Golem token
4. Copy of Cavalier of Dawn dies, triggering itself, returning Cathar's Shield from your graveyard to your hand
5. Repeat

Results

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