Declare The Incredible Hulk as an attacker, triggering the ability given to it by Bear Umbra, untapping all lands you control.
Holding priority, activate a land other than Balduvian Trading Post by tapping it, adding at least {1}.
Activate Balduvian Trading Post's second ability by paying {1} and tapping it, dealing 1 damage to The Incredible Hulk.
The Incredible Hulk triggers, putting a +1/+1 counter on it and then untapping it and causing you to gain an additional combat phase after this one.
Repeat each combat phase.

Infinite +1/+1 counters on a creature

Infinite colorless mana

Infinite combat phases

Infinite mana lands you control can produce

Infinite red mana

Infinite untap of lands you control

Bruce Banner // The Incredible Hulk

Balduvian Trading Post

Bear Umbra

Activate Balduvian Trading Post and another land by tapping them, adding at least {2}{U}.
Cast Frantic Search by paying {2}{U}.
Kitsa's prowess ability triggers, giving it +1/+1 until end of turn.
Holding priority, activate Kitsa's second ability by paying {2} and tapping it, copying Frantic Search.
Resolve the copy of Frantic Search, causing you to loot twice and untap Minamo, Balduvian Trading Post and another land.
Activate Balduvian Trading Post and another land by tapping them, adding at least {2}{U}.
Activate Minamo's second ability by paying {U} and tapping it, untapping Kitsa.
Repeat from step 4.

Infinite self-discard triggers

Infinite draw triggers

Infinite looting

Near-infinite magecraft triggers

Frantic Search

Kitsa, Otterball Elite

Minamo, School at Water's Edge

Activate Balduvian Trading Post by tapping it, adding {C}{R}.
Activate Deserted Temple's second ability by paying {1} and tapping it, targeting itself.
Locus of Enlightenment triggers, copying Deserted Temple's ability, targeting Balduvian Trading Post.
Resolve both Deserted Temple abilities, untapping it and Balduvian Trading Post.
Repeat.

The Enigma Jewel // Locus of Enlightenment

Deserted Temple

Activate Balduvian Trading Post by tapping it, adding {C}{C}{C}{R}{R}{R} due to Nyxbloom Ancient
Activate Voyaging Satyr by tapping it, untapping Balduvian Trading Post
Activate Staff of Domination's third ability by paying {3} and tapping it, untapping Voyaging Satyr.
Activate Staff of Domination's first ability by paying {1}, untapping it.
Repeat.

Infinite card draw

Infinite lifegain

Infinite lifegain triggers

Infinite mana creatures you control can produce

Infinite untap of creatures you control

Staff of Domination

Nyxbloom Ancient

Voyaging Satyr

Activate Balduvian Trading Post and up to three other lands by tapping them, adding at least {4}{W}.
Activate Adagia by paying {3}{W} and tapping it, creating a token copy of Treachery that is legendary attached to any creature.
If you control two legendary Treachery permanents, put one into your graveyard due to the legend rule.
The Treachery token's enter-the-battlefield ability triggers, untapping Adagia, Balduvian Trading Post and up to three other lands.
Repeat.

Adagia, Windswept Bastion

Treachery

Cast Staff of Domination by paying {3}.
Toph, Hardheaded Teacher triggers, earthbending Balduvian Trading Post.
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 Balduvian Trading Post's ability by tapping it, adding {C}{R}
Activate Marvin using Staff of Domination's first ability by paying {1}, untapping Marvin.
Repeat from step 6.

Marvin, Murderous Mimic

Toph, Hardheaded Teacher

Toph, the First Metalbender

Activate Lotus Field by tapping it, adding {U}{U}{U}.
Activate Balduvian Trading Post by tapping it, adding {C}{R}.
Activate Trazyn by paying {3} and tapping it, untapping Minamo, Lotus Field and Balduvian Trading Post.
Activate Minamo's second ability by paying {U}, untapping Trazyn.
Repeat from step 3.

Infinite colored mana

Candelabra of Tawnos

Trazyn the Infinite

Lotus Field

Combos with "Balduvian Trading Post"