Teshar, Ancestor's Apostle, Cloudstone Curio, Kroxa, Titan of Death's Hunger, Memnite, and Shield Sphere

Prerequisites

• Teshar, Ancestor's Apostle on the battlefield
• Cloudstone Curio on the battlefield
• Kroxa, Titan of Death's Hunger on the battlefield or in the graveyard
• Memnite in hand or on the battlefield
• Shield Sphere in hand or on the battlefield
• One of the cost creatures must be in your hand, and the other must be on the battlefield

Steps

1. Cast the historic creature from your hand by paying
2. Teshar triggers, returning Kroxa from your graveyard to the battlefield
3. When Kroxa enters the battlefield, its first and second abilities and Cloudstone Curio trigger
4. Resolve the first Kroxa trigger, causing you to sacrifice it
5. Resolve the second Kroxa trigger, causing each opponent to discard a card and lose 3 life if they didn't discard a nonland card
6. Resolve the Cloudstone Curio trigger, returning the other historic creature with mana cost from the battlefield to your hand
7. Resolve the creature spell cast in step 1
8. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite storm count
• Infinite lifeloss