Kirol, Attentive First-Year, Thassa, Deep-Dwelling, and Sunstrike Legionnaire

Prerequisites

• Kirol, Attentive First-Year on the battlefield
• Thassa, Deep-Dwelling on the battlefield
• Sunstrike Legionnaire on the battlefield

Steps

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

Results

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