Mikaeus, the Unhallowed, and Canker Abomination

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Canker Abomination in hand
• undefined available

Steps

1. Cast Canker Abomination by paying
2. When Canker Abomination enters the battlefield, it triggers, putting a number of -1/-1 counters on it equal to the number of creatures an opponent controls
3. Canker Abomination dies as a state-based action due to having 0 or less toughness, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it
4. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite death triggers