Dour Port-Mage + Shipwreck Dowser + Time Warp

Dour Port-Mage

Shipwreck Dowser

Time Warp

How it works

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

This engine gives you infinite turns by endlessly recycling your sorcery speed spells through a repeating bounce loop. You begin by casting Time Warp to secure an extra turn, followed by Shipwreck Dowser, whose entering the battlefield trigger plucks that very same Time Warp right back out of your graveyard and into your hand. To keep the chain going, Dour Port-Mage steps in with its activated ability to bounce Shipwreck Dowser back to your hand, while its passive triggered ability rewards your trouble by drawing you a card every single time that creature leaves the battlefield without dying. By resetting the entire sequence and drawing through your deck along the way, you establish an unbreakable lock that lets you dominate the game one extra turn at a time.