Sporemound + Life and Limb + Altar of Dementia

Sporemound
Life and Limb
Altar of Dementia

Requires
All permanents on the battlefield. An additional land card in hand.
Steps
  1. Play a land
  2. Sporemound triggers, creating a 1/1 Saproling token that is also a Forest
  3. Repeat step 2 any number of times
  4. Activate Altar of Dementia any number of times by sacrificing Sporemound and any number of other creatures, milling any players any number of cards
Results
Infinite creature tokens. Infinite ETB. Infinite LTB. Infinite death triggers. Infinite sacrifice triggers. Infinite mill. Infinite self-mill. Infinite landfall.