Activate Goblin Bombardment twice by sacrificing Sporuting Thrinax and Slimefoot and Squee.
When Slimefoot and Squee and Sprouting Thrinax die, Pitiless Plunderer triggers twice and Sprouting Thrinax triggers once.
Resolve the Pitiless Plunderer triggers, creating two Treasure artifact tokens.
Resolve the Sprouting Thrinax trigger, creating three 1/1 Saproling creature tokens.
Activate Goblin Bombardment twice by sacrificing two Saprolings.
When the Saprolings die, Pitiless Plunderer triggers twice, creating two Treasure artifact tokens.
Resolve the Goblin Bombardment abilities from steps 1 and 5.
Activate the Treasures by tapping and sacrificing them, adding {1}{B}{R}{G}.
Activate Slimefoot and Squee by paying {1}{B}{R}{G} and sacrificing a Saproling.
When the Saproling dies, Pitiless Plunderer triggers, creating a Treasure artifact token.
Resolve the Slimefoot and Squee ability, returning it and Sprouting Thrinax from your graveyard to the battlefield.
When Slimefoot and Squee enter the battlefield, it triggers, creating a 1/1 Saproling creature token.
Repeat.

Infinite artifact ETB

Infinite artifact LTB

Infinite artifact sacrifice triggers

Infinite artifact tokens

Infinite colored mana

Infinite creature tokens

Infinite damage

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Infinite Treasure tokens

Slimefoot and Squee

Pitiless Plunderer

Sprouting Thrinax

Goblin Bombardment

Activate Phyrexian Altar twice by sacrificing Sporuting Thrinax and Slimefoot and Squee, adding {1}{B}.
When Sprouting Thrinax dies, it triggers, creating three 1/1 Saproling creature tokens.
Activate Phyrexian Altar by sacrificing two Saprolings, adding {R}{G}.
Activate Slimefoot and Squee by paying {1}{B}{R}{G} and sacrificing a Saproling, returning it and Sprouting Thrinax from your graveyard to the battlefield.
When Slimefoot and Squee enter the battlefield, it triggers, creating a 1/1 Saproling creature token.
Repeat.

Phyrexian Altar

Activate Ashnod's Altar by sacrificing Sprouting Thrinax, adding {C}{C}.
When Sprouting Thrinax dies, it and Nim Deathmantle trigger,
Resolve the Sprouting Thrinax trigger, creating three creature tokens.
Holding priority, activate Ashnod's Altar by sacrificing a creature token, adding {C}{C}.
Resolve the Nim Deathmantle trigger, causing you to pay {4} to return Sprouting Thrinax from your graveyard to the battlefield and attach Nim Deathmantle to it.
Repeat.

Nim Deathmantle

Ashnod's Altar

Activate Phyrexian Altar by sacrificing Sprouting Thrinax, adding {1}.
Sprouting Thrinax dies, triggering itself and Nim Deathmantle.
Resolve the Sprouting Thrinax trigger, creating three 1/1 Saproling creature tokens.
Activate Phyrexian Altar three times by sacrificing the Saprolings, adding {3}.
Resolve the Nim Deathmantle trigger from step 2, causing you to pay {4} to return Sprouting Thrinax from your graveyard to the battlefield, and attach Nim Deathmantle to it.
Repeat.

Activate Thermopod's second ability by sacrificing Sprouting Thrinax, adding {R}.
When Sprouting Thrinax dies, it and Nim Deathmantle trigger.
Resolve the Sprouting Thrinax trigger, creating three 1/1 Saproling creature tokens.
Activate Thermopod's second ability three times by sacrificing the Saprolings, adding {R}{R}{R}.
Resolve the Nim Deathmantle trigger from step 2, causing you to pay {4} to return Sprouting Thrinax from your graveyard to the battlefield, and attach Nim Deathmantle to it.
Repeat.

Thermopod

Activate Orthion's first ability by paying {1}{R} 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}.
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}.
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.

Infinite copies of creatures you control with haste

Infinite creature tokens with haste

Infinite red mana

Orthion, Hero of Lavabrink

Thornbite Staff

Activate Orthion's first ability by paying {1}{R} and tapping it, creating a token copy of Sprouting Thrinax with haste.
Activate Phyrexian Altar by sacrificing the Sprouting Thrinax token, adding {R}.
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 Phyrexian Altar by sacrificing a Saproling, adding {1}.
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.

Activate Phyrexian Altar by sacrificing Sprouting Thrinax, adding {B}.
Sprouting Thrinax dies, triggering itself and Mortuary.
Resolve the Sprouting Thrinax trigger, creating three 1/1 Saproling creature tokens.
Resolve the Mortuary trigger, putting Sprouting Thrinax on top of your library from your graveyard.
Activate Phyrexian Altar twice by sacrificing two Saproling tokens, adding {R}{G}.
Cast Sprouting Thrinax from the top of your library by paying {B}{R}{G}.
Repeat.

Infinite storm count

Mortuary

Garruk's Horde

Activate Phyrexian Altar by sacrificing Sprouting Thrinax, adding {B}.
Sprouting Thrinax dies, triggering itself and Enduring Renewal.
Resolve the Sprouting Thrinax trigger, creating three 1/1 Saproling creature tokens.
Resolve the Enduring Renewal trigger, returning Sprouting Thrinax from your graveyard to your hand.
Activate Phyrexian Altar twice by sacrificing two Saprolings, adding {R}{G}.
Cast Sprouting Thrinax by paying {B}{R}{G}.
Repeat.

Combos with "Sprouting Thrinax"