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 ETB

Near-infinite 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 Stone-Seeder Hierophant by tapping it, untapping Gaea's Cradle.
Activate Gaea's Cradle by tapping it, adding at least {G}{G}{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, fetching a basic land from your library to the battlefield tapped.
When the land enters, Stone-Seeder Hierophant triggers, untapping itself.
Repeat.

Near-infinite mana lands you control can produce

Near-infinite landfall triggers

Stone-Seeder Hierophant

Gaea's Cradle

Cast the non-card copy of the spell in exile by paying its mana cost, unpreparing Studious First-Year // Rampant Growth.
When you cast that spell, Spellweaver Helix's last ability triggers, allowing you to cast a copy of the Extra Turn Sorcery without paying its mana cost and take an extra turn after this one.
Resolve the spell from step 1.
Activate Eldrazi Displacer by paying mana, flickering Studious First-Year // Rampant Growth, which enters prepared.
Repeat each turn.

Infinite turns

Lock

Extra Turn Sorcery

Card with same name as prepare spell

Spellweaver Helix

Eldrazi Displacer

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 Studious First-Year // Rampant Growth, 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.

Combos with "Studious First-Year // Rampant Growth"