Krakens, leviathans, octopi, and serpents are literally called sea monsters in Magic
And, being Magic cards, they are on average also bringing a pretty high art quality
Table of Contents show The Deck Glasspool Mimic | Illustration by Johan Grenier Commander (1) Creatures (16) Archmage Emeritus Glasspool Mimic Murmuring Mystic Nazgl x9 Ringwraiths Talrand, Sky Summoner Witch-king of Angmar Witch-king, Bringer of Ruin Instants (23) An Offer You Can't Refuse Arcane Denial Artistic Refusal Cackling Counterpart Consider Counterspell Countersquall Dig Through Time Fact or Fiction Frantic Search Go for the Throat Infernal Grasp Meeting of Minds Opt Perilous Research Pongify Rapid Hybridization Reality Shift Slip Out the Back Snap Stroke of Genius Swan Song Thought Scour Sorceries (13) Distant Melody Gitaxian Probe Irenicus's Vile Duplication Mitotic Manipulation Night's Whisper Ponder Preordain Birthday Escape Raise the Palisade Secret Salvage Serum Visions Toxic Deluge Treasure Cruise Artifacts (11) Arcane Signet Dimir Signet Everflowing Chalice Fellwar Stone Mind Stone Planar Atlas Sky Diamond Sol Ring Talisman of Dominance Thought Vessel Wayfarer's Bauble Lands (36) Bojuka Bog Choked Estuary Clearwater Pathway Command Tower Drowned Catacomb Island x12 Morphic Pool Path of Ancestry Shipwreck Marsh Swamp x13 Tainted Isle Underground River Mystic Sanctuary At the heart of this Lord of the Nazgl deck are the titular wraiths, the Nazgl
However, if you do, and that creature card is an illegal target at the time Mourner's Surprise tries to resolve, it won't resolve and none of its effects will happen
I think its most interesting home could be in a Standard control deck, however - in a two color strategy with a solid manabase, this card provides card draw over a few turns , a board presence or a blocker for one life, or a Treasure token to eventually ramp into game-winning spells
