Stalwart Successor, Umbral Collar Zealot, and Lesser Masticore

Prerequisites

• Stalwart Successor on the battlefield
• Umbral Collar Zealot on the battlefield
• Lesser Masticore on the battlefield

Steps

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

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Infinite surveil