({1} magic symbol) available, plus either ({B} magic symbol) , ({R} magic symbol) or ({G} magic symbol) available
Steps
Activate
Phyrexian Altar twice by sacrificing
Myr Battlesphere 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
Myr Battlesphere from your graveyard to the battlefield
When
Myr Battlesphere 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
Myr Battlesphere trigger, creating four 1/1 Myr creature tokens
Activate
Phyrexian Altar four times by sacrificing two Myrs,