Dockside Extortionist + Time Sieve + Sword of Hearth and Home

Dockside Extortionist
Time Sieve
Sword of Hearth and Home

Requires
All permanents on the battlefield. Opponents control at least five artifacts and/or enchantments. Sword of Hearth and Home attached to another creature you control that can attack this turn, and that cannot be blocked by an opponent.
Steps
  1. Deal combat damage to an opponent using Sword of Hearth and Home
  2. Sword of Hearth and Home triggers, causing you to exile Dockside Extortionist, search your library for a basic land card, and put both cards onto the battlefield
  3. Dockside Extortionist enters the battlefield, creating at least five Treasure tokens
  4. Activate Time Sieve by tapping and sacrificing five Treasures, causing you to take an extra turn after this one
  5. Repeat each turn
Results
Infinite turns.