Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, and Triskelion

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Triskelion on the battlefield

Steps

1. If Triskelion has two or more +1/+1 counters on it, activate Triskelion by removing a +1/+1 counter from it, dealing 1 damage to any other target
2. Repeat step 1 until Triskelion has one +1/+1 counter on it
3. Activate Triskelion by removing a +1/+1 counter from it, dealing 1 damage to itself
4. Triskelion dies as a state-based action due to having 0 toughness
5. It's persist ability triggers, returning it from your graveyard to the battlefield with two +1/+1 counters on it due to its ability
6. Reoeat

Results

• Infinite LTB
• Infinite ETB
• Infinite death triggers
• Infinite damage