Dour Port-Mage, Time Walk, and Skullwinder

Prerequisites

• Dour Port-Mage on the battlefield
• Time Walk in hand
• Skullwinder in hand
• available plus enough mana to cast Time Walk and Skullwinder each turn

Steps

1. Cast Time Walk by paying its mana cost, causing you to take an extra turn after this one
2. Cast Skullwinder by paying its mana cost
3. When Skullwinder enters the battlefield, it triggers, returning Time Walk from your graveyard to your hand
4. Move to your next turn
5. Activate Dour Port-Mage by paying and tapping it, returning Skullwinder from the battlefield to your hand
6. Dour Port-Mage triggers, causing you to draw a card
7. Repeat

Results

• Infinite turns