Kirol, Attentive First-Year, Midnight Guard, and Meneldor, Swift Savior

Prerequisites

• Kirol, Attentive First-Year on the battlefield
• Midnight Guard on the battlefield
• Meneldor, Swift Savior on the battlefield

Steps

1. Deal combat damage using Meneldor, triggering its ability
2. Holding priority, activate Kirol by tapping it and Midnight Guard
3. copying Meneldor's trigger, targeting Kirol
4. Resolve the copy of Meneldor's trigger, blinking Kirol
5. When Kirol enters, Midnight Guard triggers, untapping Midnight Guard
6. Repeat from step 2

Results

• Infinite ETB
• Infinite LTB