Stalwart Successor, Blasting Station, and Twilight Shepherd

Prerequisites

• Stalwart Successor on the battlefield
• Blasting Station on the battlefield
• Twilight Shepherd on the battlefield

Steps

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

Results

• Infinite ETB
• Infinite LTB
• Infinite damage
• Infinite death triggers
• Infinite sacrifice triggers