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Sealock Monster

{3}{U}{U}

Creature — Octopus

PLSTThe List#DDO-42uncommon
Finishes
Nonfoil
Border
black
Frame
2015
Illustrator
Adam Paquette
CommanderLegalModernLegalStandardNot legal
Format legality

Constructed

StandardNot legal
PioneerLegal
ModernLegal
LegacyLegal
VintageLegal
PauperNot legal

Commander

CommanderLegal
Pauper CommanderNot legal
Duel CommanderLegal
PreDHNot legal
OathbreakerLegal
Tiny LeadersNot legal

Arena

AlchemyNot legal
HistoricNot legal
TimelessNot legal
BrawlNot legal
Standard BrawlNot legal
Competitive BrawlNot legal
GladiatorNot legal

Other

PremodernNot legal
Old SchoolNot legal
Penny DreadfulLegal
Future StandardNot legal
This creature can't attack unless defending player controls an Island. {5}{U}{U}: 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
Market · per finishtrend updated 5h ago · prices as of Oct 15, 2026
$0.01 low$0.00 gap
Cheapest playable copy$0.10· across 3 printings· view the cheapest printing ›

Price history

last 30 days · set by the window above · each finish on its own scale
Nonfoil$0.28+12.0%30D
30D range$0.25to$0.28Since Feb 2024:H $0.28L $0.04

Other printings

3 totalCompare all printings
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Found in

3 productsRounded odds
  • Mystery Booster Booster Pack (Convention Edition)

    Booster Pack · $25.53

    Nonfoil under 1%
  • Mystery Booster Booster Pack (Retail Edition)

    Booster Pack · $28.05

    Nonfoil under 1%
  • Mystery Booster Booster Pack (Convention Edition - 2021)

    Booster Pack · $17.94

    Nonfoil under 1%

Rulings

4 · latest Sep 15, 2013
  • WotCSep 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.

  • WotCSep 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.

  • WotCSep 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.

  • WotCSep 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 “{T}: Add {U}.”