---
name: "Great Hall of the Biblioplex"
mana_cost: "N/A"
cmc: 0
type_line: "Land"
colors: []
color_identity: []
keywords: []
set: "SOS"
set_name: "Secrets of Strixhaven"
collector_number: "257"
rarity: "rare"
artist: "Constantin Marin"
oracle_id: "a8c70dab-1e27-4a9c-bd2d-910d5720d02d"
canonical_url: "https://avascry.com/printing/great-hall-of-the-biblioplex-sos"
legalities:
  commander: "legal"
  standard: "legal"
  modern: "legal"
  pioneer: "legal"
  legacy: "legal"
  vintage: "legal"
  pauper: "not_legal"
  penny: "not_legal"
---

# Great Hall of the Biblioplex
- **Mana Cost:** `N/A` (CMC: 0)
- **Type:** Land

## Oracle Text
{T}: Add {C}.
{T}, Pay 1 life: Add one mana of any color. Spend this mana only to cast an instant or sorcery spell.
{5}: If this land isn't a creature, it becomes a 2/4 Wizard creature with "Whenever you cast an instant or sorcery spell, this creature gets +1/+0 until end of turn." It's still a land.

## Top 4096-Dim Neural Synergies
1. [Hall of Oracles](/printing/hall-of-oracles-soc.md) — Land
2. [Great Hall of the Citadel](/printing/great-hall-of-the-citadel-ltr.md) — Land
3. [Cavern of Souls](/printing/cavern-of-souls-lci.md) — Land
4. [Guildmages' Forum](/printing/guildmages-forum-grn.md) — Land
5. [Secluded Courtyard](/printing/secluded-courtyard-msc.md) — Land
6. [Ancient Ziggurat](/printing/ancient-ziggurat-ecc.md) — Land

## Printing Details
- **Set:** Secrets of Strixhaven (SOS) #257
- **Rarity:** Rare
- **Artist:** Constantin Marin

## Format Legalities
Commander: `legal` | Standard: `legal` | Modern: `legal` | Pioneer: `legal` | Legacy: `legal` | Vintage: `legal` | Pauper: `not_legal` | Penny: `not_legal`

## Official Rulings
- *(2026-03-20)* If this land becomes a creature but you haven't controlled it continuously since your most recent turn began, you won't be able to activate its mana ability or attack with it that turn.