Kirol, Attentive First-Year, Midnight Guard, and Don & Leo, Problem Solvers

Prerequisites

• Kirol, Attentive First-Year on the battlefield
• Midnight Guard on the battlefield
• Don & Leo, Problem Solvers on the battlefield

Steps

1. At the beginning of your end step, Don & Leo triggers
2. Holding priority, activate Kirol by tapping it and Midnight Guard
3. copying Don & Leo's trigger, targeting Kirol
4. Resolve the copy of Don & Leo's trigger, blinking Kirol
5. When Kirol enters, Midnight Guard triggers, untapping Midnight Guard
6. Repeat from step 2

Results

• Infinite ETB
• Infinite LTB