Floodtide Serpent 
Creature — Serpent
$0.10 #29978 0.00 12.6 years
This creature can't attack unless you return an enchantment you control to its owner's hand. (This cost is paid as attackers are declared.)
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Cards similar to Floodtide Serpent 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.
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"This creature can't attack or block if an enchantment is on the battlefield."
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$0.04↓#22623↑0.29↑11.1 years↓
"This creature can't attack alone."
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$0.12↑#310750.29↑9.9 years↓
"This creature can't attack alone."
Raging Kronch74%
$0.04↓#301330.007.3 years↓
"This creature can't attack alone."
Giant Turtle73%
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"This creature can't attack if it attacked during your last turn."
Godhunter Octopus72%
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$0.12↑#267200.25↑4.5 years↓
"When this creature enters, you may return an enchantment you control to its owner's hand. If you do, you gain 3 life."
Drake Familiar72%
$0.09↓#279050.0720.9 years↑
"When this creature enters, sacrifice it unless you return an enchantment to its owner's hand."