2 cards where the name includes “sea” and the name includes “monster”

Sealock Monster (Duel Decks: Elspeth vs. Kiora #42)

Sealock Monster {3}{U}{U}

Creature — Octopus

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

5/5

Illustrated by Adam Paquette

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Sea Monster (Tempest Remastered #65)

Sea Monster {4}{U}{U}

Creature — Serpent

Sea Monster can’t attack unless defending player controls an Island.

Water is life. Or perhaps it is just something to wash it down with.

6/6

Illustrated by Daniel Gelon

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny

The message was clear to Sorin—time to search for something else.