Time Vault, and Elder Druid

Prerequisites

• Time Vault on the battlefield
• Elder Druid on the battlefield
• Elder Druid does not have summoning sickness
• each turn available

Steps

1. Activate Elder Druid by paying and 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