Infested Thrinax enters the battlefield, it triggers, causing you to create a number of 1/1 Saproling creature tokens when a nontoken creature you control dies.
Activate
Phyrexian Altar by sacrificing
Slimefoot and Squee, adding ({B} magic symbol) .
When
Slimefoot and Squee dies,
Infested Thrinax triggers, creating three 1/1 Saproling creature tokens.
Activate
Phyrexian Altar by sacrificing
Infested Thrinax, adding ({R} magic symbol) .
When
Infested Thrinax dies, its delayed ability triggers, creating four 1/1 Saproling creature tokens.
Activate
Phyrexian Altar twice by sacrificing two Saproling tokens, adding ({1} magic symbol) ({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
Infested Thrinax from your graveyard to the battlefield.
When
Slimefoot and Squee and
Infested Thrinax enter the battlefield, they each trigger.
Resolve the
Slimefoot and Squee trigger, creating a 1/1 Saproling creature token.
Resolve the
Infested Thrinax trigger, causing you to create a number of 1/1 Saproling creature tokens when a nontoken creature you control dies.
Activate
Phyrexian Altar by sacrificing
Slimefoot and Squee, adding ({B} magic symbol) .
When
Slimefoot and Squee dies,
Infested Thrinax triggers twice, creating six 1/1 Saproling creature tokens.
You may repeat steps 12 and 13 once for another nontoken creature you control, if desired.
Activate
Phyrexian Altar three times by sacrificing three Saproling tokens, adding ({1} magic symbol) ({R} magic symbol) ({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 up to one other creature from your graveyard to the battlefield.
When
Slimefoot and Squee enters the battlefield, it triggers, creating a 1/1 Saproling creature token.