---
name: "Assert Authority"
mana_cost: "{5}{U}{U}"
cmc: 7
type_line: "Instant"
colors: ["U"]
color_identity: ["U"]
keywords: ["Affinity"]
set: "MRD"
set_name: "Mirrodin"
collector_number: "30"
rarity: "uncommon"
artist: "Greg Hildebrandt"
oracle_id: "085bc7be-bd44-40af-8e8f-a1a8006fe22c"
canonical_url: "https://avascry.com/printing/assert-authority-mrd"
legalities:
  commander: "legal"
  standard: "not_legal"
  modern: "legal"
  pioneer: "not_legal"
  legacy: "legal"
  vintage: "legal"
  pauper: "not_legal"
  penny: "not_legal"
---

# Assert Authority
- **Mana Cost:** `{5}{U}{U}` (CMC: 7)
- **Type:** Instant
- **Keywords:** Affinity

## Oracle Text
Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

## Top 4096-Dim Neural Synergies
1. [Override](/printing/override-mrd.md) — Instant
2. [Machinist's Dismissal](/printing/machinists-dismissal-yeoe.md) — Instant
3. [Stoic Rebuttal](/printing/stoic-rebuttal-td2.md) — Instant
4. [Into Thin Air](/printing/into-thin-air-5dn.md) — Instant
5. [Halt Order](/printing/halt-order-som.md) — Instant
6. [Annul](/printing/annul-wc04.md) — Instant

## Printing Details
- **Set:** Mirrodin (MRD) #30
- **Rarity:** Uncommon
- **Artist:** Greg Hildebrandt
- **Total Printings:** 9 across all historical editions

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