Frontline Observer
Secrets of Eternity · #EN039

Frontline Observer

Frontline Observer is a Rare Effect Monster from Secrets of Eternity (EN039) in the Yu-Gi-Oh! TCG. Stats: EARTH, Level 4, ATK 1000, DEF 1500. Cactaur's latest catalog snapshot shows a market reference near $0.25 for ungraded copies.

Secrets of Eternity set collectorsPrice-conscious singles buyers
TCGPlayer market $0.25
Cardmarket trend
Rarity Rare
App coming soon

Who is this card for?

Frontline Observer suits collectors and players working on Secrets of Eternity who need the Rare slot. Compare listing photos to your target edition and confirm the YGOPRODeck set code before buying online.

What is Frontline Observer from Secrets of Eternity?

Frontline Observer is a Effect Monster in Secrets of Eternity numbered EN039. EARTH, Level 4, ATK 1000, DEF 1500. Frontline Observer (EN039) from Secrets of Eternity should be evaluated with set context, stats, archetype, and condition together. This printing is from Secrets of Eternity.

What is Frontline Observer worth today?

Cactaur tracks a market reference near $0.25 for Frontline Observer. Low and high spread runs $0.25 to null. This printing is from Secrets of Eternity. Collector number EN039 distinguishes this printing from same-name cards in other sets. Catalogued rarity: Rare. The set released in 2015.

SetSecrets of Eternity
NumberEN039
RarityRare
TCGPlayer USD$0.25
Cardmarket EUR

How collectible is Frontline Observer?

Frontline Observer is a Rare printing in Secrets of Eternity. Master set builders use set code and passcode to track completion progress. This printing is from Secrets of Eternity. Collector number EN039 distinguishes this printing from same-name cards in other sets. Catalogued rarity: Rare.

What are the key details for Frontline Observer?

Frontline Observer lists as Effect Monster (Machine). Rules text is indexed in the catalog for search and deck research. This printing is from Secrets of Eternity. Collector number EN039 distinguishes this printing from same-name cards in other sets. Catalogued rarity: Rare. The set released in 2015.

Cactaur's take

Frontline Observer (EN039) from Secrets of Eternity should be evaluated with set context, stats, archetype, and condition together.

Pros

  • Frontline Observer is catalogued as Rare Effect Monster in Secrets of Eternity, making set code and passcode verification straightforward.
  • Public market data shows a reference near $0.25.
  • EARTH, Level 4, ATK 1000, DEF 1500 helps deck builders confirm the correct printing quickly.

Cons

  • Raw market prices vary by condition and edition — near-mint estimates are not slab grades.

Verdict: Use $0.25 as a benchmark, then adjust for edition, grade, and how quickly you need to buy or sell.

FAQ

What is Frontline Observer from Secrets of Eternity?

Frontline Observer is a Rare Effect Monster from Secrets of Eternity numbered EN039 in the Yu-Gi-Oh! TCG. Cactaur indexes set, rarity, stats, and market references for this printing.

How much is Frontline Observer worth?

Cactaur's catalog snapshot shows a market reference near $0.25 for ungraded Frontline Observer. Condition, edition, and recent sold comps can move realized prices above or below that benchmark.

What rarity is Frontline Observer?

Frontline Observer is catalogued as Rare in Secrets of Eternity. Use the set code on listings to confirm you are buying this exact printing. This printing is from Secrets of Eternity.

How do I verify the correct Frontline Observer printing?

Match set code sece, collector number EN039, and edition. YGOPRODeck-backed metadata on this page is the reference Cactaur uses for catalog keys. This printing is from Secrets of Eternity.

Should I buy Frontline Observer near mint or played?

Near-mint copies command the catalog reference near $0.25. Heavily played copies trade lower unless the card is a chase rare where any clean copy is scarce.

Related cards

Trust & data sources. Cactaur displays catalog and market data from pokemontcg.io embedded TCGPlayer/Cardmarket references. Prices change frequently and are not guarantees.

Cactaur does not authenticate cards or guarantee values. Scan your copy in the iPhone app for condition-aware guidance.

Catalog snapshot: 2026-06-25. Last updated: 2026-06-25.