Urabrask the Hidden + Sword of Hearth and Home + Combat Celebrant

Urabrask the Hidden
Sword of Hearth and Home
Combat Celebrant

Requires
All permanents on the battlefield. Sword of Hearth and Home attached to Urabrask. An opponent is unable to block and kill Urabrask.
Steps
  1. Declare Urabrask and Combat Celebrant as attackers, choosing to exert Combat Celebrant as it attacks
  2. Combat Celebrant triggers, untapping all other creatures you control and causing you to get an additional combat phase after this one
  3. Deal combat damage to an opponent with Urabrask
  4. Sword of Hearth and Home triggers, exiling Combat Celebrant, then causing you to search your library for a basic land card, then put the land and Combat Celebrant onto the battlefield
  5. Repeat each combat phase
Results
Infinite combat phases. Infinite combat damage. Infinite ETB. Infinite LTB. Near-infinite landfall triggers. Put all basic land cards from your library onto the battlefield.