Activate the creature that taps for mana by tapping it, adding at least {1}{G}.
Cast the copy of Rampant Growth from exile by paying {1}{G}, unpreparing Studious First-Year.
When you cast that spell, Displacer Kitten triggers, blinking Studious First-Year, which enters prepared.
Resolve Rampant Growth, searching your library for a basic land and putting it onto the battlefield tapped.
When the land enters, Retreat to Coralhelm triggers, untapping the creature that taps for mana.
Repeat.

Near-infinite creature ETB

Near-infinite creature LTB

Near-infinite magecraft triggers

Near-infinite mana creatures you control can produce

Near-infinite storm count

Put all basic lands from your library onto the battlefield tapped

Creature that taps for 2+ mana

Studious First-Year // Rampant Growth

Retreat to Coralhelm

Displacer Kitten

Activate the mana-producing creature by tapping it, adding at least {2}.
Activate Yenna by paying {2} and tapping it, creating a token copy of Estrid's Invocation. Choose to have Estrid's Invocation enter the battlefield as a copy of Second Wind attached to the mana-producing creature. Then, untap Yenna and scry 2.
Activate the Second Wind token's second ability by tapping it, untapping the mana-producing creature.
Repeat.

Infinite scry

Yenna, Redtooth Regent

Second Wind

Estrid's Invocation

Activate the mana-producing creature by tapping it, adding at least {2}.
Activate Yenna by paying {2} and tapping it, creating a token copy of Second Wind attached to the mana-producing creature, then untapping Yenna and causing you to scry 2.
Activate the Second Wind token's second ability by tapping it, untapping the mana-producing creature.
Activate Thaumatog by sacrificing the Second Wind token.
Repeat.

Infinitely large creature until end of turn

Thaumatog

Activate the mana-producing creature by tapping it, adding at least {2}.
Activate Yenna by paying {2} and tapping it, creating a token copy of Second Wind attached to the mana-producing creature, then untapping Yenna and causing you to scry 2.
Put the oldest Second Wind into your graveyard due to the legend rule.
Activate the Second Wind token's second ability by tapping it, untapping the mana-producing creature.
Repeat.

Leyline of Singularity

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