Mikaeus, the Unhallowed + Cinderhaze Wretch

Mikaeus, the Unhallowed
Cinderhaze Wretch

Requires
Mikaeus, the Unhallowed must be on the battlefield. Cinderhaze Wretch must be on the battlefield.
Steps
  1. Activate Cinderhaze Wretch's second ability by putting a -1/-1 counter on it, untapping it.
  2. Repeat step 1 until Cinderhaze Wretch dies as a state-based action due to having zero toughness.
  3. Cinderhaze Wretch dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  4. Repeat.
Results
Infinite death triggers. Infinite ETB. Infinite LTB.