Stalwart Successor, Ravenous Intruder, and Lesser Masticore

Prerequisites

• Stalwart Successor on the battlefield
• Ravenous Intruder on the battlefield
• Lesser Masticore on the battlefield

Steps

1. Activate Ravenous Intruder 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 Ravenous Intruder ability
3. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Infinitely large creature until end of turn