Thor, God of Thunder, Time Stretch, and Soulherder

Prerequisites

• Thor, God of Thunder on the battlefield
• Time Stretch in hand
• Soulherder on the battlefield
• each other turn available

Steps

1. Cast Time Stretch by paying its mana cost
2. Thor's second ability triggers, dealing damage to any target
3. Resolve Time Stretch, causing you to take two extra turns after this one Move to your first extra turn Blink Thor using Soulherder
4. When Thor enters, it triggers, exiling Time Stretch from your graveyard and allowing you to cast it from exile until the end of your next turn
5. Move to your next turn
6. Cast Time Stretch from exile by paying its mana cost
7. Repeat from step 2

Results

• Infinite turns
• Lock