Stalwart Successor, Thermopod, and Gravelgill Axeshark

Prerequisites

• Stalwart Successor on the battlefield
• Thermopod on the battlefield
• Gravelgill Axeshark on the battlefield

Steps

1. Activate Thermopod 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 Repeat

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinite red mana
• Infinite creature sacrifice triggers