Restless Apparition, Bartolomé del Presidio, and Hardened Academic

Prerequisites

• Restless Apparition on the battlefield
• Bartolomé del Presidio on the battlefield
• Hardened Academic on the battlefield

Steps

1. Activate Bartolomé del Presidio by sacrificing Restless Apparition
2. When Restless Apparition dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. Hardened Academic triggers, putting a +1/+1 counter on Restless Apparition
4. Resolve the Bartolomé del Presidio ability
5. Repeat

Results

• Infinite +1/+1 counters on a creature
• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinite creature sacrifice triggers