Stalwart Successor, Bartolomé del Presidio, and Gravelgill Axeshark

Prerequisites

• Stalwart Successor on the battlefield
• Bartolomé del Presidio on the battlefield
• Gravelgill Axeshark on the battlefield

Steps

1. Activate Bartolomé del Presidio by sacrificing Gravelgill Axeshark When Gravelgill Axeshark dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
2. When Gravelgill Axeshark enters, Stalwart Successor triggers, putting a +1/+1 counter on Gravelgill Axeshark Resolve the Bartolomé del Presidio ability
3. Repeat

Results

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