Gravecrawler + Phyrexian Altar

Gravecrawler
Phyrexian Altar

Requires
Gravecrawler must be on the battlefield. Phyrexian Altar must be on the battlefield. You control an additional Zombie.
Steps
  1. Activate Phyrexian Altar by sacrificing Gravecrawler, adding b.
  2. Cast Gravecrawler from your graveyard by paying b.
  3. Repeat.
Results
Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers. Infinite storm count.