Nim Deathmantle + Ashnod's Altar + Conscripted Infantry

Nim Deathmantle
Ashnod's Altar
Conscripted Infantry

Requires
All permanents on the battlefield.
Steps
  1. Activate Ashnod's Altar by sacrificing Conscripted Infantry, adding cc
  2. Conscripted Infantry dies, triggering itself and Nim Deathmantle
  3. Resolve the Conscripted Infantry trigger, creating a 1/1 Soldier artifact creature token
  4. Activate Ashnod's Altar by sacrificing the Soldier, adding cc
  5. Resolve the Nim Deathmantle trigger from step 2, causing you to pay 4 to return Conscripted Infantry from your graveyard to the battlefield, and attach Nim Deathmantle to it
  6. Repeat
Results
Infinite ETB. Infinite LTB. Infinite death triggers. Infinite sacrifice triggers.