22 cards where the card types include “leviathan”

Aethersquall Ancient (Kaladesh #39)
Archipelagore (Ikoria: Lair of Behemoths #41)
Breaching Leviathan (Commander 2014 #12)
Charix, the Raging Isle (Zendikar Rising #49)
Eater of Days (Darksteel #120)
Grozoth (Ravnica: City of Guilds #53)
Inkwell Leviathan (Double Masters #55)
Jokulmorder (Coldsnap #37)
Kederekt Leviathan (Double Masters 2022 #55)
Kiora's Dambreaker (Ravnica Remastered #48)
Leviathan (Time Spiral Timeshifted #23)
Nemesis of Reason (Commander Legends: Battle for Baldur's Gate #850)
Nimbus Swimmer (Duel Decks: Elspeth vs. Kiora #54)
Pearl Lake Ancient (Khans of Tarkir #49)
Segovian Leviathan (Classic Sixth Edition #97)
Simic Sky Swallower (Commander Legends #452)
Sky Swallower (Guildpact #34)
Slinn Voda, the Rising Deep (Commander Legends #405)
Stormtide Leviathan (Commander Legends #407)
Thing from the Deep (Masters Edition IV #68)
Trench Gorger (Commander 2011 #65)
Xyris, the Writhing Storm (Dominaria United Commander #175)

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