Mikaeus, the Unhallowed + Triskelion

Mikaeus, the Unhallowed
Triskelion

Requires
Mikaeus, the Unhallowed must be on the battlefield. Triskelion must be 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.