---
name: "Cloud Key"
mana_cost: "{3}"
cmc: 3
type_line: "Artifact"
colors: []
color_identity: []
keywords: []
set: "BRR"
set_name: "The Brothers' War Retro Artifacts"
collector_number: "75"
rarity: "rare"
artist: "Trevor Hairsine"
oracle_id: "2a838818-d590-4374-9a63-d9e6381a0f0d"
canonical_url: "https://avascry.com/printing/cloud-key-brr"
legalities:
  commander: "legal"
  standard: "not_legal"
  modern: "legal"
  pioneer: "not_legal"
  legacy: "legal"
  vintage: "legal"
  pauper: "not_legal"
  penny: "legal"
---

# Cloud Key
- **Mana Cost:** `{3}` (CMC: 3)
- **Type:** Artifact

## Oracle Text
As this artifact enters, choose artifact, creature, enchantment, instant, or sorcery.
Spells you cast of the chosen type cost {1} less to cast.

> *"Uma chave apenas abre uma porta. Quem a usa precisa escolher atravessar esse limiar."
— *Metafísica de Hurkyl, vol. II**

## Top 4096-Dim Neural Synergies
1. [Gathering Stone](/printing/gathering-stone-ecl.md) — Artifact
2. [Urza's Incubator](/printing/urzas-incubator-cm2.md) — Artifact
3. [Mana Matrix](/printing/mana-matrix-me4.md) — Artifact
4. [Progenitor's Icon](/printing/progenitors-icon-lcc.md) — Artifact
5. [Door of Destinies](/printing/door-of-destinies-msc.md) — Artifact
6. [Pillar of Origins](/printing/pillar-of-origins-cmm.md) — Artifact

## Printing Details
- **Set:** The Brothers' War Retro Artifacts (BRR) #75
- **Rarity:** Rare
- **Artist:** Trevor Hairsine
- **Total Printings:** 46 across all historical editions

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