Sealock Monster

Sealock Monster

Creature — Octopus

Sealock Monster 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 Sealock Monster becomes monstrous, target land becomes an Island in addition to its other types.

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Printings View all

Set Rarity
Duel Decks: Elspeth vs. Kiora (DDO) Uncommon
Theros (THS) Uncommon

Combos Browse all


Format Legality
Tiny Leaders Legal
Noble Legal
Leviathan Legal
Hero Legal
Magic Duels Legal
Canadian Highlander Legal
Vintage Legal
Modern Legal
Penny Dreadful Legal
Pioneer Legal
MTGO Legal
Vanguard Legal
Legacy Legal
Archenemy Legal
Planechase Legal
1v1 Commander Legal
Duel Commander Legal
Oathbreaker Legal
Unformat Legal
Casual Legal
Commander / EDH Legal

Sealock Monster Discussion

carpecanum on cephaild tribal!!!!!!!

1 year ago

Octopus Umbra, Lorthos, the Tidemaker and Sealock Monster for flavor and some brute force.

Thada Adel, Acquisitor is about the best ramp mono blue has. So many Sol Rings...

WhichKing on Thassa's chosen: Arixmethes

1 year ago

Looks good, I just find that it feels very susceptible to early aggro, especially once you invest your mana in a big creature only to get it blown up by removal. I feel like you can include some thematic sea creatures like Chasm Skulker, Reef Worm, Sealock Monster, Sand Squid etc.

FiveEightFiveBC on Arixmethes Infinite mana win

1 year ago

Despite the higher mana cost of Sealock Monster, it seems like it's going to work much better for you. In a four-player game, it's likely that someone will be playing blue--and thus have islands--but if not, you'll have a chance to gift somebody with their very own island when you use its monstrous ability. I see Sealock Monster fitting in here much better than Thing in the Ice  Flip.

S1ayerMonkey on Deep, Deep Down They Sleep

1 year ago

Thanks guys :)

And yes hydrothermia, the purpose of Nylea's Presence is to make an opponent's land an island for Sealock Monster and Harbor Serpent

ToxicMoonlight on Thassa

1 year ago

Hi mushtard! I really like this deck list you have. I also have a Thassa, God of the Sea deck that looks almost like it! If I were to make some changes, I would take out any underwhelming cards like Thassa's Emissary & Sealock Monster for more impactful spells like Cyclonic Rift, Nykthos, Shrine to Nyx, & Pearl Lake Ancient. I'm also very unsure about the new Octopus Umbra. It's very flavorful, sure, but in a deck where your creatures are already big and scary it may not be that useful. I'll need to play with that more... If you ever want to take a look at my Thassa, God of the Sea deck and use it as a reference, you're more than welcome to do so anytime!

We Must Have Hit A Reef [Thassa, God of the Sea]

Commander / EDH ToxicMoonlight


Orion93 on The Big Wave

3 years ago

Sealock Monster ensures inkwell can work with no blockers aside from stormtide

Ballzanya on krak

3 years ago

Lastly, it does seem like you have a few too many creatures with such a high converted mana cost. Having too many 7-9 drop creatures could mean you just get those in your hand and can't play them until later in the game, by which time you could just be dead already by faster, more aggressive decks. This still applies even if you intend to keep this as a casual/kitchen table magic type of deck, as even other decks that fit that description can often have cheaper, more efficient, and deadly creatures. So, my advice is to pick a good handful of bigger creatures, and scrap the rest in favor of cards I mentioned.

I like the two copies of Simic Sky Swallower and Inkwell Leviathan since they have trample and shroud, so they're doing something for all that mana that's somewhat worth it. But having four copies of Deep-Sea Kraken, the Sealock Monster and Shipbreaker Kraken, doesn't seem necessary.

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