Liliana, Untouched by Death + Rooftop Storm + Altar of Dementia

Liliana, Untouched by Death
Rooftop Storm
Altar of Dementia

Requires
All permanents on the battlefield. Liliana has at least three loyalty counters. You control a nontoken Zombie.
Steps
  1. Activate Liliana's third loyalty ability by removing three loyalty counters from it, allowing you to cast Zombie spells from your graveyard this turn
  2. Activate Altar of Dementia by sacrificing a nontoken Zombie, causing target player to mill cards equal to the Zombie's power
  3. Cast the Zombie from your graveyard by paying 0
  4. Repeat from step 2
Results
Infinite ETB. Infinite LTB. Infinite death triggers. Infinite sacrifice triggers. Infinite storm count. Infinite mill. Infinite self-mill.