Ephemerate, Mnemonic Wall, and Time Warp

Prerequisites

• Ephemerate in hand
• Mnemonic Wall on the battlefield
• Time Warp in hand
• each turn available

Steps

1. Cast Time Warp by paying its mana cost, causing you to take an extra turn after this one
2. Cast Ephemerate by paying , blinking Mnemonic Wall and exiling Ephemerate
3. When Mnemonic Wall enters, it triggers, returning Time Warp from your graveyard to your hand
4. Move to your next turn
5. At the beginning of your upkeep, Ephemerate's rebound ability triggers, causing you to cast it from exile without paying its mana cost
6. Resolve Ephemerate, blinking Mnemonic Wall
7. When Mnemonic Wall enters, it triggers, returning Ephemerate from your graveyard to your hand
8. Repeat

Results

• Infinite turns
• Lock