Karmic Guide + Reveillark + Viscera Seer

Karmic Guide
Reveillark
Viscera Seer

Requires
All permanents on the battlefield.
Steps
  1. Activate Viscera Seer by sacrificing Karmic Guide, causing you to scry 1
  2. Activate Viscera Seer by sacrificing Reveillark
  3. When Reveillark dies, it triggers, returning Karmic Guide from your graveyard to the battlefield
  4. When Karmic Guide enters the battlefield, it triggers, returning Reveillark from your graveyard to the battlefield
  5. Resolve the Viscera Seer ability from step 2, causing you to scry 1
  6. Repeat
Results
Infinite ETB. Infinite LTB. Infinite death triggers. Infinite sacrifice triggers. Infinite scry 1.