Dour Port-Mage + Temporal Manipulation + Mnemonic Wall

Dour Port-Mage

Temporal Manipulation

Mnemonic Wall

How it works

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

This clever setup achieves infinite turns by using Dour Port-Mage’s activated ability to bounce Mnemonic Wall back to your hand, which in turn triggers Mnemonic Wall's entry ability to retrieve Temporal Manipulation from your graveyard. As a wonderful bonus, Dour Port-Mage also rewards you with a card draw every time Mnemonic Wall leaves the battlefield without dying, turning your infinite loop into a complete deck-drawing engine.