({1} magic symbol) , plus either ({B} magic symbol) , ({R} magic symbol) or ({G} magic symbol) available available.
Steps
Activate
Phyrexian Altar twice by sacrificing
Beetleback Chief and
Slimefoot and Squee, adding two mana in any combination of ({B} magic symbol) , ({R} magic symbol) or ({G} magic symbol) .
Activate
Slimefoot and Squee by paying ({1} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) and sacrificing a Saproling, returning it and
Beetleback Chief from your graveyard to the battlefield.
When
Beetleback Chief and
Slimefoot and Squee enter the battlefield, their abilities trigger.
Resolve the
Slimefoot and Squee trigger, creating a 1/1 Saproling creature token.
Resolve the
Beetleback Chief trigger, creating two 1/1 Goblin creature tokens.
Activate
Phyrexian Altar four times by sacrificing the two Goblins,