Walking Ballista + Mikaeus, the Unhallowed

Walking Ballista
Mikaeus, the Unhallowed

Requires
Walking Ballista must be on the battlefield. Mikaeus, the Unhallowed must be on the battlefield. Walking Ballista on the battlefield with a +1/+1 counter on it.
Steps
  1. Activate Walking Ballista's last ability by removing a +1/+1 counter from it, dealing 1 damage to itself.
  2. Walking Ballista dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  3. Repeat.
Results
Infinite death triggers. Infinite ETB. Infinite LTB.