Studious First-Year // Rampant Growth + Displacer Kitten + Stone-Seeder Hierophant + Nykthos, Shrine to Nyx

How it works

Activate Stone-Seeder Hierophant by tapping it, untapping Nykthos, Shrine to Nyx.
Activate Nykthos, Shrine to Nyx by paying and tapping it, adding at least .
Cast the copy of Rampant Growth from exile by paying , 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.

In which brackets is this combo allowed, per Spellbook's Exhibition tier?

1–2 · Exhibition & Core

Allowed in this bracket.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.