Declare Emeritus of Abundance as an attacker, triggering its ability, causing it to become prepared.
Cast Time Warp by paying its mana cost, causing you to take an extra turn after this one.
Cast a copy of Regrowth by paying {1}{G}, returning Time Warp from your graveyard to your hand.
Repeat each turn.

Return all cards from your graveyard to your hand

Infinite turns

Lock

Emeritus of Abundance // Regrowth

Time Warp

Activate any number of other lands by tapping them, adding at least {8}{G}{G}.
Activate Skycoach Waypoint's second ability by paying {3} and tapping it, causing Emeritus of Abundance to become prepared.
Cast Rude Awakening by paying {4}{G}, untapping all lands you control.
Cast a copy of Regrowth by paying {1}{G}, returning Rude Awakening from your graveyard to your hand.
Repeat.

Near-infinite storm count

Near-infinite magecraft triggers

Infinite mana lands you control can produce

Infinite untap of lands you control

Skycoach Waypoint

Rude Awakening

Cast a copy of the prepared spell by paying its mana cost.
When you cast that spell, Displacer Kitten and Dovescape trigger.
Resolve the Dovescape trigger, countering the prepared spell and creating a number of 1/1 flying Bird creature tokens equal to its mana value.
Resolve the Displacer Kitten trigger, blinking Emeritus of Abundance // Regrowth, which enters prepared.
Activate Phyrexian Altar by sacrificing a Bird token, adding one mana of any color.
Repeat step 5 until you have enough mana to cast the prepared spell.
Repeat.

Near-infinite creature ETB

Near-infinite creature LTB

Infinite colored mana

Infinite creature tokens

Infinite death triggers

Infinite creature sacrifice triggers

Dovescape

Displacer Kitten

Phyrexian Altar

Cast the extra turn spell by paying its mana cost, causing you to take an extra turn after this one.
Cast the copy of Regrowth from exile by paying {1}{G} and unpreparing Emeritus of Abundance, returning the extra turn card from your graveyard to your hand.
Declare Emeritus of Abundance as an attacker, triggering it, causing it to become prepared.
Repeat each turn.

Extra Turn Spell - GY on Resolution

Cast Regrowth using Caetus, Sea Tyrant of Segovia's convoke ability by tapping creatures you control.
Displacer Kitten triggers, blinking Emeritus of Abundance.
When Emeritus of Abundance enters, Intruder Alarm triggers, untapping all creatures you control.
Repeat.

Intruder Alarm

Invasion of Segovia // Caetus, Sea Tyrant of Segovia

Cast a copy of Regrowth from exile by paying {1}{G}, targeting any card besides the actual Regrowth.
Pyromancer's Ascension's first ability triggers, allowing you to put a quest counter on it.
Resolve the copy of Regrowth, returning that card from your graveyard to your hand.
Declare Emeritus of Abundance as an attacker.
When Emeritus of Abundance attacks, it triggers, becoming prepared.
During your second main phase, cast a copy of Regrowth by paying {1}{G}, targeting the actual Regrowth card.
Pyromancer Ascension's first ability triggers, allowing you to put a quest counter on it.
Resolve the copy of Regrowth, returning Regrowth from your graveyard to your hand.
Cast Early Harvest by paying its mana cost.
Pyromancer Ascension's second ability triggers, copying Early Harvest.
Resolve a copy of Early Harvest, untapping basic lands you control.
Activate those lands by tapping them, adding mana.
Resolve the remaining copy of Early Harvest, untapping lands you control.
Activate those lands by tapping them, adding mana.
Activate Ashnod's Altar by sacrificing Emeritus of Abundance, producing that card's result.
Cast the card Regrowth from your hand by paying {1}{G}, targeting Emeritus of Abundance.
Pyromancer Ascension's second ability triggers, copying Regrowth and allowing you to target Early Harvest with the copy.
Resolve both copies of Regrowth, returning Emeritus of Abundance and Early Harvest from your graveyard to your hand.
Cast Early Harvest by paying its mana cost.
Pyromancer Ascension's second ability triggers, copying Early Harvest.
Resolve a copy of Early Harvest, untapping lands you control.
Activate those lands by tapping them, adding mana.
Resolve the remaining copy of Early Harvest, untapping lands you control.
Activate those lands by tapping them, adding mana.
Cast Emeritus of Abundance by paying {2}{G}.
Cast a copy of Regrowth from exile by paying {1}{G}, targeting Early Harvest.
Both of Pyromancer Ascension's abilities trigger.
In response, activate Ashnod's Altar by sacrificing Emeritus of Ideation, producing that card's result.
Resolve Pyromancer Ascension's first abiliity, putting a redundant quest counter on it if desired.
Resolve Pyromancer Ascension's second ability, copying Regrowth and targeting Emeritus of Abundance with the copy.
Repeat from step 18.

Infinite untap of basic lands you control

Regrowth

Pyromancer Ascension

Early Harvest

Ashnod's Altar

Cast Brass's Bounty by paying {6}{R}, creating at least eight Treasure tokens.
Activate two of those Treasure tokens by tapping and sacrificing them, adding two mana.
Cast a copy of Regrowth from exile by paying {1}{G}, targeting Brass's Bounty.
Pyromancer's Ascension's first ability triggers, allowing you to put a quest counter on it.
Resolve the copy of Regrowth, returning Brass's Bounty from your graveyard to your hand.
Declare Emeritus of Abundance as an attacker.
When Emeritus of Abundance attacks, it triggers, becoming prepared.
During your second main phase, activate your remaining Treasure tokens by tapping and sacrificing them, adding at least six mana.
Cast a copy of Regrowth by paying {1}{G}, targeting the actual Regrowth card.
Pyromancer Ascension's first ability triggers, allowing you to put a quest counter on it.
Resolve the copy of Regrowth, returning Regrowth from your graveyard to your hand.
Cast Brass's Bounty by paying {6}{R}.
Pyromancer Ascension's second ability triggers, copying Brass's Bounty.
Resolve both copies of Brass's Bounty, creating at least sixteen Treasure tokens.
Activate those Treasure tokens by tapping and sacrificing them, adding at least sixteen mana.
Activate Thermopod by sacrificing Emeritus of Abundance, adding {R}.
Cast the card Regrowth from your hand by paying {1}{G}, targeting Emeritus of Abundance.
Pyromancer Ascension's second ability triggers, copying Regrowth and allowing you to target Brass's Bounty with the copy.
Resolve both copies of Regrowth, returning Emeritus of Abundance and Brass's Bounty from your graveyard to your hand.
Cast Brass's Bounty by paying its mana cost.
Pyromancer Ascension's second ability triggers, copying Brass's Bounty.
Resolve both copies of Brass's Bounty, creating at least sixteen Treasure tokens.
Activate those Treasure tokens by tapping and sacrificing them, adding at least sixteen mana.
Cast Emeritus of Abundance by paying {2}{G}.
Cast a copy of Regrowth from exile by paying {1}{G}, targeting Brass's Bounty.
Both of Pyromancer Ascension's abilities trigger.
In response, activate Thermopod by sacrificing Emeritus of Ideation, adding {R}.
Resolve Pyromancer Ascension's first abiliity, putting a redundant quest counter on it if desired.
Resolve Pyromancer Ascension's second ability, copying Regrowth and targeting Emeritus of Abundance with the copy.
Repeat from step 19.

Thermopod

Brass's Bounty

Combos with "Emeritus of Abundance // Regrowth"