Activate Urza's first ability by tapping Pili-Pala, adding {U}.
Activate Pili-Pala by paying {1} and untapping it, adding one mana of any color.
Repeat.
Once you have infinite mana, you may use it to activate Urza's ability.

Cast all spells in your library

Infinite colored mana

Exile your library

Urza, Lord High Artificer

Pili-Pala

Training Grounds

Activate Urza, Prince of Kroog by paying {4}, creating a token copy of Training Grounds that is a 1/1 Soldier in addition to its other types.
Activate Urza, Lord High Artificer's first ability by tapping the Training Grounds token, adding {U}.
Activate Urza, Prince of Kroog by paying {2}, creating a token copy of Training Grounds that is a 1/1 Soldier in addition to its other types.
Activate Urza, Lord High Artificer's first ability by tapping the Training Grounds token, adding {U}.
Activate Urza, Prince of Kroog by paying {1}, creating a token copy of Training Grounds that is a 1/1 Soldier in addition to its other types.
Activate Urza, Lord High Artificer's first ability by tapping the Training Grounds token, adding {U}.
Repeat from step 5.

Infinite creature ETB

Infinite tapped creature tokens

Urza, Prince of Kroog

Encroaching Mycosynth

Mycosynth Lattice

Activate Kenrith by paying {G}, putting two +1/+1 counters on Crystalline Crawler.
Activate Crystalline Crawler by removing a +1/+1 counter from it, adding {G}.
Repeat.

Infinite +1/+1 counters on creatures you control

Infinite card draw for any number of players

Infinite draw triggers for any number of opponents

Infinite lifegain

Infinite lifegain triggers

Return all creature cards from all graveyards to the battlefield under your control

Kenrith, the Returned King

Crystalline Crawler

High Score

Activate Codie by paying {2} and tapping it, adding {W}{U}{B}{R}{G}.
Activate High Alert by paying {W}{U}, untapping Codie.
Repeat.
Once you have an arbitrarily large number of Codie triggers, you may cast any instant or sorcery spell by paying its mana cost.
Codie triggers for each time you activated its ability.
Resolve the first trigger, causing you to exile cards from the top of your library until you exile an instant or sorcery spell with lesser mana value, and allowing you to cast that spell without paying its mana cost.
Repeat step 6 for each remaining trigger.
You may also repeat this combo for each instant and/or sorcery card in your hand, and on subsequent turns.

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