Extravagant Replication + Time Stretch + Skullwinder

Extravagant Replication

Time Stretch

Skullwinder

How it works

1. Cast Time Stretch by paying its mana cost, causing you to take two extra turns after this one.
2. Move to your next turn.
3. At the beginning of your upkeep, Extravagant Replication triggers, creating a token copy of Skullwinder.
4. When the Skullwinder token enters the battlefield, it triggers, returning Time Stretch from your graveyard to your hand.
5. Repeat during your second turn.

This brilliant setup locks down the game by chaining infinite extra turns through meticulous replication. You kick things off by casting Time Stretch to earn two subsequent turns, letting you set up the engine. Once Extravagant Replication triggers at the beginning of your upkeep, it churns out a token copy of Skullwinder. The token's own enters-the-battlefield ability then reaches into your graveyard to fish back the original Time Stretch, looping the process indefinitely so you never run out of turns.