Time Vault, and Aphetto Alchemist

Prerequisites

• Time Vault on the battlefield
• Aphetto Alchemist on the battlefield
• Aphetto Alchemist does not have summoning sickness

Steps

1. Activate Aphetto Alchemist by tapping it, untap Time Vault
2. Activate Time Vault by tapping it, causing you to take an extra turn after this one
3. Repeat each turn

Results

• Infinite turns