All permanents on the battlefield (Creature that taps for 2+ mana without summoning sickness).
Steps
Activate the creature that taps for mana by tapping it, adding at least ({1} magic symbol) ({G} magic symbol) .
Cast the copy of
Rampant Growth from exile by paying ({1} magic symbol) ({G} magic symbol) , 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.
Notes
Only the creatures that tap for green mana will work. The creature must tap for at least ({2} magic symbol) ({G} magic symbol) for this combo to add near-infinite mana.
Results
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.
Metadata
In 2 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).