Slimefoot and Squee + Nim Deathmantle + Ashnod's Altar

Slimefoot and Squee
Nim Deathmantle
Ashnod's Altar

Requires
All permanents on the battlefield. 2 available.
Steps
  1. Activate Ashnod's Altar by sacrificing Slimefoot and Squee, adding cc
  2. Slimefoot and Squee dies, triggering Nim Deathmantle, causing you to pay 4 to return Slimefoot and Squee from your graveyard to the battlefield, and attach Nim Deathmantle to it
  3. Slimefoot and Squee enters the battlefield, creating a 1/1 Saproling creature token
  4. Activate Ashnod's Altar by sacrificing the Saproling, adding cc
  5. Repeat
Results
Infinite ETB. Infinite LTB. Infinite death triggers. Infinite sacrifice triggers.