Slimefoot and Squee + Phyrexian Altar + Phyrexian Triniform

Slimefoot and Squee
Phyrexian Altar
Phyrexian Triniform

Requires
All permanents on the battlefield. You control at least one Saproling.
Steps
  1. Activate Phyrexian Altar twice by sacrificing Phyrexian Triniform and Slimefoot and Squee, adding 1b
  2. When Phyrexian Triniform dies, it triggers, creating three 3/3 Phyrexian Golem artifact creature tokens
  3. Activate Phyrexian Altar by sacrificing two Phyrexian Golems, adding rg
  4. Activate Slimefoot and Squee by paying 1brg and sacrificing a Saproling, returning it and Phyrexian Triniform from your graveyard to the battlefield
  5. When Slimefoot and Squee enter the battlefield, it triggers, creating a 1/1 Saproling creature token
  6. Repeat
Results
Infinite creature tokens. Infinite colored mana. Infinite ETB. Infinite LTB. Infinite death triggers. Infinite sacrifice triggers.