How much is Sealock Monster worth?

As of August 2026, Sealock Monster from Theros has a market value of €0.06. Track price trends and find local trades on Lootstack.

What finishes is Sealock Monster available in?

Sealock Monster is available in Foil, Nonfoil. Each finish may have a different market value — compare prices for each version on Lootstack.

What set is Sealock Monster from?

Sealock Monster is from the Theros (THS) expansion, part of the Magic: The Gathering trading card game.

What rarity is Sealock Monster?

Sealock Monster is a Uncommon card from the Theros set in Magic: The Gathering.

What type of card is Sealock Monster?

Sealock Monster is a Creature — Octopus from the Theros set in Magic: The Gathering.

Is Sealock Monster legal in Modern?

Sealock Monster is Legal in Modern. Check all format legalities for this Magic: The Gathering card on Lootstack.

Sealock Monster - Theros

Card Availability

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Legalities

UNKNOWN

Brawl

LEGAL

Commander

LEGAL

Duel

UNKNOWN

Future

UNKNOWN

Frontier

UNKNOWN

Historic

LEGAL

Legacy

LEGAL

Modern

UNKNOWN

Oathbreaker

UNKNOWN

Pauper

LEGAL

Penny

LEGAL

Pioneer

UNKNOWN

Standard

LEGAL

Vintage

Foreign Versions

Available in:

Rules & Rulings

9/15/2013

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 “: Add .”

9/15/2013

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.

9/15/2013

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.

9/15/2013

Once a creature becomes monstrous, it can't become monstrous again. If the creature is already monstrous when the monstrosity ability resolves, nothing happens.