Cass, Hand of Vengeance, Woe Strider, and Historian's Boon

Prerequisites

• Cass, Hand of Vengeance on the battlefield
• Woe Strider on the battlefield
• Historian's Boon on the battlefield

Steps

1. Activate Woe Strider by sacrificing another creature that has an Aura attached to it
2. When the creature dies, Cass triggers, returning an Aura that was attached to the creature from your graveyard to the battlefield attached to another creature you control
3. When the Aura enters the battlefield, Historian's Boon triggers, creating a creature token
4. Resolve the Woe Strider ability
5. Repeat

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinite creature sacrifice triggers
• Infinite scry 1