Stalwart Successor, Thunderblust, and Yahenni, Undying Partisan

Prerequisites

• Stalwart Successor on the battlefield
• Thunderblust on the battlefield
• Yahenni, Undying Partisan on the battlefield

Steps

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

Results

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