Ashaya, Soul of the Wild, Celestial Dawn, Emeria Shepherd, and Umbral Collar Zealot

Prerequisites

• Ashaya, Soul of the Wild on the battlefield
• Celestial Dawn on the battlefield
• Emeria Shepherd on the battlefield
• Umbral Collar Zealot on the battlefield

Steps

1. Cast any creature by paying its mana cost
2. When the creature enters as a Plains due to Ashaya and Emeria Shepherd, Emeria Shepherd triggers
3. Holding priority, activate Umbral Collar Zealot by sacrificing the creature cast in step 1
4. Resolve the Emeria Shepherd trigger, returning another creature from your graveyard to the battlefield
5. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite landfall triggers
• Return all creature cards from your graveyard to the battlefield
• Infinite surveil 1