Glen Elendra Pranksters, Phyrexian Walker, Vivien, Champion of the Wilds, and Crookshank Kobolds

Prerequisites

• Glen Elendra Pranksters on the battlefield
• Phyrexian Walker in hand or on the battlefield
• Vivien, Champion of the Wilds on the battlefield
• Crookshank Kobolds in hand or on the battlefield

Steps

1. During an opponent's turn, cast the -cost creature in your hand by paying
2. Glen Elendra Pranksters triggers, returning the other -cost creature from the battlefield to your hand
3. Resolve the spell from step 1
4. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite storm count