Cass, Hand of Vengeance + Phyrexian Altar + Historian's Boon

Prerequisites

• You control an Aura that is attached to another creature you control.
• You control at least one additional creature beyond the creature that has the Aura attached.

Steps

1. 1Activate Phyrexian Altar by sacrificing another creature that has an Aura attached to it.
2. 2When 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. 3When the Aura enters the battlefield, Historian's Boon triggers, creating a creature token.
4. 4Repeat.

Effects

• Infinite colored mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers