Mikaeus, the Unhallowed, Grim Poppet, and Bartolomé del Presidio

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Grim Poppet on the battlefield
• Bartolomé del Presidio on the battlefield

Steps

1. Activate Bartolomé del Presidio by sacrificing Grim Poppet
2. When Grim Poppet dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
3. This will be removed by its static ability, which will result in Grim Poppet having two -1/-1 counters instead
4. Resolve the Bartolomé del Presidio ability
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite -1/-1 counters
• Infinite +1/+1 counters on Bartolomé del Presidio