Thor, God of Thunder, Time Walk, and Don & Leo, Problem Solvers

Prerequisites

• Thor, God of Thunder on the battlefield
• Time Walk in hand
• Don & Leo, Problem Solvers on the battlefield
• each turn available

Steps

1. Cast Time Walk by paying its mana cost
2. Thor's second ability triggers, dealing damage to any target
3. Resolve Time Walk, causing you to take an extra turn after this one
4. Blink Thor using Don & Leo
5. When Thor enters, it triggers, allowing you to cast Time Walk from your graveyard until the end of your next turn
6. Move to your next turn
7. Cast Time Walk from your graveyard by paying its mana cost
8. Repeat from step 2

Results

• Infinite turns
• Lock