---
name: "Sealock Monster"
mana_cost: "{3}{U}{U}"
cmc: 5
type_line: "Creature — Octopus"
colors: ["U"]
color_identity: ["U"]
keywords: ["Monstrosity"]
set: "PLST"
set_name: "The List"
collector_number: "DDO-42"
rarity: "uncommon"
artist: "Adam Paquette"
oracle_id: "351c4f85-8792-4710-8cc9-d3e36657f6db"
canonical_url: "https://avascry.com/printing/sealock-monster-plst"
legalities:
  commander: "legal"
  standard: "not_legal"
  modern: "legal"
  pioneer: "legal"
  legacy: "legal"
  vintage: "legal"
  pauper: "not_legal"
  penny: "legal"
---

# Sealock Monster
- **Mana Cost:** `{3}{U}{U}` (CMC: 5)
- **Type:** Creature — Octopus
- **Power/Toughness:** 5/5
- **Keywords:** Monstrosity

## Oracle Text
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.

## Top 4096-Dim Neural Synergies
1. [Sea Monster](/printing/sea-monster-7ed.md) — Creature — Serpent
2. [Sea Serpent](/printing/sea-serpent-leb.md) — Creature — Serpent
3. [Kukemssa Serpent](/printing/kukemssa-serpent-mir.md) — Creature — Serpent
4. [Deep-Sea Serpent](/printing/deep-sea-serpent-por.md) — Creature — Serpent
5. [Skittering Crustacean](/printing/skittering-crustacean-pz2.md) — Creature — Crab
6. [Shipbreaker Kraken](/printing/shipbreaker-kraken-cmr.md) — Creature — Kraken

## Printing Details
- **Set:** The List (PLST) #DDO-42
- **Rarity:** Uncommon
- **Artist:** Adam Paquette
- **Total Printings:** 14 across all historical editions

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