Kirol, Attentive First-Year, Midnight Guard, and Felidar Guardian

Prerequisites

• Kirol, Attentive First-Year on the battlefield
• Midnight Guard on the battlefield
• Felidar Guardian on the battlefield
• available

Steps

1. Cast Felidar Guardian by paying
2. When Felidar Guardian enters, it and Midnight Guard trigger
3. Resolve the Midnight Guard trigger, untapping it
4. Holding priority, activate Kirol by tapping it and Midnight Guard
5. copying Felidar Guardian's trigger, targeting Kirol
6. Resolve the copy of Felidar Guardian's trigger, blinking Kirol
7. When Kirol enters, Midnight Guard triggers, untapping Midnight Guard
8. Repeat from step 4

Results

• Infinite ETB
• Infinite LTB