Cast the artifact by paying {0}.
Toph, Hardheaded Teacher triggers, earthbending Gruul Turf.
Resolve the artifact spell.
Activate Zuran Orb by sacrificing Gruul Turf.
When Gruul Turf dies, Toph, Hardheaded Teach triggers, returning Gruul Turf from your graveyard to the battlefield tapped.
When Gruul Turf enters, it triggers, returning the artifact cast in step 1 from the battlefield to your hand, as it's a land due to Toph, the First Metalbender.
Resolve the Zuran Orb ability
Repeat.

Infinite creature ETB

Infinite creature LTB

Infinite death triggers

Infinite landfall triggers

Infinite lifegain

Infinite lifegain triggers

Infinite creature sacrifice triggers

Infinite storm count

Infinite artifact ETB

Infinite artifact LTB

Artifact Castable for {0} that survives

Toph, the First Metalbender

Toph, Hardheaded Teacher

Zuran Orb

Gruul Turf

Activate Gaea's Cradle and another land by tapping them, adding at least {G}{G}{G}
Cast Constant Mists with buyback by paying {1}{G} and sacrificing a land that wasn't tapped for mana in step 1.
Toph's second ability triggers, earthbending Gaea's Cradle
Resolve Constant Mists, returning it to your hand.
Cast Constant Mists with buyback by paying {1}{G} and sacrificing Gaea's Cradle.
Toph triggers twice. Resolve the first trigger, earthbending another land you control.
Resolve the second Toph trigger, returning Gaea's Cradle from your graveyard to the battlefield tapped.
When Gaea's Cradle enters, Amulet of Vigor triggers, untapping Gaea's Cradle.
Resolve Constant Mists, returning it to your hand.
Activate Gaea's Cradle by tapping it, adding at least {G}{G}{G}.
Cast Constant Mists with buyback by paying {1}{G} and sacrificing the land that was earthbent in step 6.
Toph triggers twice. Resolve the first trigger, earthbending Gaea's Cradle.
Resolve the second Toph trigger, returning the sacrificed land from your graveyard to the battlefield tapped.
When the land enters, Amulet of Vigor triggers, untapping the land.
Resolve Constant Mists, returning it to your hand.
Activate the land that entered by tapping it adding at least {1}.
Repeat from step 5.

Infinite mana lands you control can produce

Infinite green mana

Infinite magecraft triggers

Gaea's Cradle

Constant Mists

Amulet of Vigor

Activate Gaea's Cradle and another land by tapping them, adding at least {G}{G}{G}
Cast Constant Mists with buyback by paying {1}{G} and sacrificing a land that wasn't tapped for mana in step 1.
Toph's second ability triggers, earthbending Gaea's Cradle
Resolve Constant Mists, returning it to your hand.
Cast Constant Mists with buyback by paying {1}{G} and sacrificing Gaea's Cradle.
Toph triggers twice. Resolve the first trigger, earthbending another land you control.
Resolve the second Toph trigger, returning Gaea's Cradle from your graveyard to the battlefield untapped due to Spelunking
Resolve Constant Mists, returning it to your hand.
Activate Gaea's Cradle by tapping it, adding at least {G}{G}{G}.
Cast Constant Mists with buyback by paying {1}{G} and sacrificing the land that was earthbent in step 6.
Toph triggers twice. Resolve the first trigger, earthbending Gaea's Cradle.
Resolve the second Toph trigger, returning the sacrificed land from your graveyard to the battlefield untapped due to Spelunking.
Resolve Constant Mists, returning it to your hand.
Activate the land that entered by tapping it adding at least {1}.
Repeat from step 5.

Infinite card draw

Infinite draw triggers

Spelunking

Cast Staff of Domination by paying {3}.
Toph, Hardheaded Teacher triggers, earthbending Lotus Field.
Cast Marvin by paying {2}.
Toph, Hardheaded Teacher triggers, earthbending Staff of Domination.
At the beginning of your end step, Toph, the First Metalbender triggers, earthbending Marvin, thus giving it haste.
Activate Marvin using Lotus Field's ability by tapping it, adding three mana of any color
Activate Marvin using Staff of Domination's first ability by paying {1}, untapping Marvin.
Repeat from step 6.

Infinite colored mana

Infinite mana creatures you control can produce

Infinite untap of creatures you control

Marvin, Murderous Mimic

Staff of Domination

Lotus Field

Cast Etali either from your hand or the command zone by paying {5}{R}{R} plus commander tax if applicable.
When Etali enters, it triggers.
Holding priority, activate Goblin Bombardment by sacrificing Etali.
When Etali dies, Yedora triggers, returning Etali from your graveyard to the battlefield face-down as a Forest land.
Resolve the Goblin Bombardment ability.
Holding priority, activate Etali by tapping it, adding {G}.
Resolve the Etali trigger from step 2, exiling cards from the top of each library until each player has exiled a nonland card, and causing you to cast any number of those cards without paying its mana cost.
For each card cast, Toph's second ability triggers once.
Resolve the first Toph trigger, earthbending Etali.
Resolve any remaining triggers, earthbending any other lands you desire. If you do not want to earthbend other lands, target Etali with all remaining triggers.
Activate Goblin Bombardment by sacrificing Etali.
When Etali dies, Toph and Yedora trigger.
Resolve the Yedora trigger, choosing not to return Etali.
Resolve the Toph trigger, returning Etali from your graveyard to the battlefield tapped.
Repeat from step 2.
Resolve all Goblin Bombardment abilities from step 11.

Cast all spells in your library

Cast any number of spells from opponents' libraries

Exile all libraries

Near-infinite creature ETB

Near-infinite creature LTB

Near-infinite damage

Near-infinite death triggers

Near-infinite green mana

Near-infinite landfall triggers

Near-infinite magecraft triggers

Near-infinite recursion of lands you control

Near-infinite creature sacrifice triggers

Near-infinite storm count

Etali, Primal Conqueror // Etali, Primal Sickness

Yedora, Grave Gardener

Goblin Bombardment

Cast any spell by paying {0} due to Jodah and Aang, Master of Elements.
Toph triggers, earthbending a land.
Auton Soldier triggers, causing you to reveal cards from the top of your library until you reveal a nonland card and put it into your hand due to Abundance.
Resolve the spell cast in step 1, and repeat from step 1 as able.

Avatar Aang // Aang, Master of Elements

Abundance

Jodah, Archmage Eternal

Auton Soldier

Combos with "Toph, Hardheaded Teacher"