Mikaeus, the Unhallowed, and Triskelion

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Triskelion on the battlefield
• Triskelion has at least two +1/+1 counters on it

Steps

1. If Triskelion has at least three +1/+1 counters on it, activate Triskelion by removing a +1/+1 counter from it, dealing 1 damage to any target
2. Repeat step 1 until there are two +1/+1 counters remaining on Triskelion
3. Activate Triskelion by removing a +1/+1 counter from Triskelion, dealing 1 damage to itself
4. Repeat step 3 an additional time
5. Triskelion dies
6. Triskelion's undying ability triggers, returning it to the battlefield with an additional +1/+1 counter on it
7. Repeat

Results

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