Kirol, Attentive First-Year, Helm of the Host, and Elspeth, Storm Slayer

Prerequisites

• Kirol, Attentive First-Year on the battlefield
• Helm of the Host on the battlefield
• Elspeth, Storm Slayer on the battlefield

Steps

1. At the beginning of your combat phase, Helm of the Host triggers
2. Holding priority, activate Kirol by tapping two creatures you control, copying the Helm of the Host trigger
3. Resolve the copy of the Helm of the Host trigger, creating two token copies of Kirol that aren't legendary
4. Holding priority, activate the Kirol token by tapping two creatures you control, copying the Helm of the Host trigger
5. Repeat from step 3

Results

• Infinite ETB
• Infinite tapped creature tokens