Serpent of Yawning Depths 
Enchantment Creature — Serpent
$9.76 #4637 0.32 6.7 years
Krakens, Leviathans, Octopuses, and Serpents you control can't be blocked except by Krakens, Leviathans, Octopuses, and Serpents.
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Cards similar to Serpent of Yawning Depths expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Whelming Wave78%
$0.87↓#2388↑0.69↑12.7 years↑
"Return all creatures to their owners' hands except for Krakens, Leviathans, Octopuses, and Serpents."
Spawning Kraken72%
$14.24↑#41320.19↓5.5 years↓
"Whenever a Kraken, Leviathan, Octopus, or Serpent you control deals combat damage to a player, create a 9/9 blue Kraken creature token."
Slinn Voda, the Rising Deep70%
$0.32↓#47690.258.5 years↑
"When this card enters, if it was kicked, return all creatures to their owners' hands except for Merfolk, Krakens, Leviathans, Octopuses, and Serpents."