Stalwart Successor, Grinding Station, and Wingrattle Scarecrow

Prerequisites

• Stalwart Successor on the battlefield
• Grinding Station on the battlefield
• Wingrattle Scarecrow on the battlefield

Steps

1. Activate Grinding Station by tapping it and sacrificing Wingrattle Scarecrow When Wingrattle Scarecrow dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
2. When Wingrattle Scarecrow enters, Grinding Station and Stalwart Successor trigger
3. Resolve the Grinding Station trigger, untapping it Resolve the Stalwart Successor trigger, putting a +1/+1 counter on Wingrattle Scarecrow Resolve the Grinding Station ability from step 1 Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control