Dour Port-Mage + Returned Pastcaller + Time Walk

Dour Port-Mage

Returned Pastcaller

Time Walk

How it works

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

This Vintage-legal engine leverages the recursive power of Returned Pastcaller to secure infinite turns by repeatedly buying back Time Walk from your graveyard every time it enters the battlefield. To reset this loop, you rely on Dour Port-Mage's activated ability to bounce Returned Pastcaller back to your hand, which conveniently triggers the Mage's passive card-draw ability to keep your hand full while you lock down the game.