Ephemerate, Zealous Lorecaster, and Time Stretch

Prerequisites

• Ephemerate in hand
• Zealous Lorecaster on the battlefield
• Time Stretch in hand
• each other turn available

Steps

1. Cast Time Stretch by paying its mana cost, causing you to take an extra turn after this one
2. Cast Ephemerate by paying , blinking Zealous Lorecaster and exiling Ephemerate
3. When Zealous Lorecaster enters, it triggers, returning Time Stretch 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 Zealous Lorecaster
7. When Zealous Lorecaster enters, it triggers, returning Ephemerate from your graveyard to your hand
8. Repeat during your second extra turn

Results

• Infinite turns
• Lock