Sealock Monster
THSTheros/#62/2013Uncommon
Colour IDMV 5
Current paper retail
Card Kingdom$0.35
Cardmarket€0.03
ManaPool$0.15
TCGplayer$0.12
MTGO (Cardhoarder)
retail$0.03 tix
Paper retail history (USD)
3 providers
Latest $0.35High $0.35Low $0.35▲ 0.0%
Market and collecting
Market overview
$0.12TCGplayer, USD, retail, nonfoil
Latest observation: 2026-11-10
7d▲ 0.0%30d▲ 9.1%90d▲ 100.0%
90d high
$0.12
90d low
$0.06
Paper printings priced
3
Currently 2nd
Cheapest paper printing
$0.08
Duel Decks: Elspeth vs. Kiora
- Up 9.1% over the last 30 days on TCGplayer.
- Trading at or near its 90 day high of $0.12.
- This printing is the 2nd cheapest paper printing currently priced (3 priced in total).
- Foil copies of this printing carry a 242% premium over nonfoil.
Find this printing on eBayView on TCGplayerAffiliate. MTGPrices may earn from qualifying eBay and TCGplayer purchases.
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Compare printings (3 priced)
Gameplay and rules
Creature — Octopus
This creature can't attack unless defending player controls an Island.
: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)
When this creature becomes monstrous, target land becomes an Island in addition to its other types.
5 / 5
Keywords
Monstrosity
Card capabilities
Creature
Derived deterministically from card types, Oracle text and keywords. Not a strategic evaluation.
Format legality
Primary formats
Eternal formats
Digital formats
Rulings (4)
wotc15 Sept 2013
An ability that triggers when a creature becomes monstrous won't trigger if that creature isn't on the battlefield when its monstrosity ability resolves.
wotc15 Sept 2013
Monstrous isn't an ability that a creature has. It's just something true about that creature. If the creature stops being a creature or loses its abilities, it will continue to be monstrous.
wotc15 Sept 2013
Once a creature becomes monstrous, it can't become monstrous again. If the creature is already monstrous when the monstrosity ability resolves, nothing happens.
wotc15 Sept 2013
The effect making the land an Island doesn't have a duration and will last indefinitely. The land retains any land types and abilities it already had. An Island has the ability “{T}: Add {U}.”
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Ranked by shared capabilities, colour identity, mana value and type. Never by strategic judgement.
About this card
Sealock Monster
Sealock Monster is a Creature — Octopus, with mana cost {3}{U}{U} (mana value 5). Printed 3 times across MTG sets.
Format legality: Commander: legal, Modern: legal, Standard: not_legal, Pioneer: legal, Legacy: legal, Pauper: not_legal.
Current headline price on TCGplayer: $0.12 (up 9.1% over 30 days).
Frequently asked
Sealock Monster FAQ
How much is Sealock Monster worth?
The current TCGplayer USD retail price for Sealock Monster is $0.12. It is up 9.1% over the last 30 days. Over 90 days it has ranged from $0.06 to $0.12.
What is the cheapest printing of Sealock Monster?
The cheapest currently priced paper printing is from Duel Decks: Elspeth vs. Kiora at $0.08 on TCGplayer.
What is the most expensive printing of Sealock Monster?
The most expensive currently priced paper printing is from The List at $0.27 on TCGplayer.
How many printings of Sealock Monster are there?
Sealock Monster has been printed 3 times in English paper sets that MTGPrices tracks.
What set was Sealock Monster first printed in?
The earliest English paper printing that MTGPrices tracks is from THS #62, released 2013-09-27.
What is the newest printing of Sealock Monster?
The most recent English paper printing that MTGPrices tracks is from PLST #DDO-42, released 2019-11-07.
Is there a foil version of Sealock Monster?
Yes. On this printing, foil copies trade at $0.41 versus $0.12 for nonfoil, which is 242% more expensive on TCGplayer.
Is Sealock Monster legal in Commander?
Yes, Sealock Monster is currently legal in Commander per Scryfall's legality feed.