Kirol, Attentive First-Year, Midnight Guard, and Airbender Ascension

Prerequisites

• Kirol, Attentive First-Year on the battlefield
• Midnight Guard on the battlefield
• Airbender Ascension on the battlefield

Steps

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

Results

• Infinite ETB
• Infinite LTB
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control