Activate Orthion's first ability by paying ({1} magic symbol) ({R} magic symbol) and tapping it, creating a token copy of Sprouting Thrinax with haste.
Activate Thermopod's second ability by sacrificing the Sprouting Thrinax token, adding ({R} magic symbol) .
When the Sprouting Thrinax token dies, it and Orthion trigger.
Resolve the Orthion trigger, untapping it.
Resolve the Sprouting Thrinax trigger, creating three 1/1 Saproling creature tokens.
Activate Thermopod's second ability by sacrificing a Saproling, adding ({R} magic symbol) .
Repeat.
Once you have infinite Saprolings, you may forego sacrificing the Sprouting Thrinax tokens.
You may also then use Orthion's second ability targeting any creature you control.
Results
Infinite copies of creatures you control with haste.