Kirol, Attentive First-Year, Midnight Guard, and Y'shtola Rhul

Prerequisites

• Kirol, Attentive First-Year on the battlefield
• Midnight Guard on the battlefield
• Y'shtola Rhul on the battlefield

Steps

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

Results

• Infinite ETB
• Infinite LTB