Kirol, Attentive First-Year, The Neutrinos, and Sunstrike Legionnaire

Prerequisites

• Kirol, Attentive First-Year on the battlefield
• The Neutrinos on the battlefield
• Sunstrike Legionnaire on the battlefield

Steps

1. Declare The Neutrinos as attackers, triggering its ability
2. Holding priority, activate Kirol by tapping it and Sunstrike Legionnaire
3. copying The Neutrinos's trigger, targeting Kirol
4. Resolve the copy of The Neutrinos's trigger, blinking Kirol
5. When Kirol enters, The Neutrinos and Sunstrike Legionnaire trigger
6. Resolve the Sunstrike Legionnaire trigger, untapping it
7. Resolve the Neutrinos trigger, giving it +1/+0 until end of turn
8. Repeat from step 2

Results

• Infinite ETB
• Infinite LTB
• Infinitely powerful creature until end of turn