---
name: "Crystal Skull, Isu Spyglass"
mana_cost: "{2}{U}{U}"
cmc: 4
type_line: "Legendary Artifact"
colors: ["U"]
color_identity: ["U"]
keywords: []
set: "ACR"
set_name: "Assassin's Creed"
collector_number: "158"
rarity: "rare"
artist: "Thanh Tuấn"
oracle_id: "b1f8eb7b-7e01-4bf8-a557-64e16a6052af"
canonical_url: "https://avascry.com/printing/crystal-skull-isu-spyglass-acr"
legalities:
  commander: "legal"
  standard: "not_legal"
  modern: "legal"
  pioneer: "not_legal"
  legacy: "legal"
  vintage: "legal"
  pauper: "not_legal"
  penny: "legal"
---

# Crystal Skull, Isu Spyglass
- **Mana Cost:** `{2}{U}{U}` (CMC: 4)
- **Type:** Legendary Artifact

## Oracle Text
You may look at the top card of your library any time.
You may play historic lands and cast historic spells from the top of your library. (Artifacts, legendaries, and Sagas are historic.)
{T}: Add {U}.

> *The device can spy on anyone with just a drop of their blood.*

## Top 4096-Dim Neural Synergies
1. [Mystic Forge](/printing/mystic-forge-pip.md) — Artifact
2. [Lens of Clarity](/printing/lens-of-clarity-ktk.md) — Artifact
3. [Johann, Apprentice Sorcerer](/printing/johann-apprentice-sorcerer-woe.md) — Legendary Creature — Human Wizard Sorcerer
4. [Precognition Field](/printing/precognition-field-pdom.md) — Enchantment
5. [Future Sight](/printing/future-sight-mb2.md) — Enchantment
6. [Board the Weatherlight](/printing/board-the-weatherlight-dom.md) — Sorcery

## Printing Details
- **Set:** Assassin's Creed (ACR) #158
- **Rarity:** Rare
- **Artist:** Thanh Tuấn
- **Total Printings:** 17 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`