Dauntless River Marshal {1}{W}
Creature — Human Soldier
This creature gets +1/+1 as long as you control an Island.
{3}{U}: Tap target creature.
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Cards that do something similar 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.
Harbor Bandit 100%
$0.17#28832
"This creature gets +1/+1 as long as you control an Island."
+1 more matching line
Cryptic Cruiser 87%
$0.07#26751
"{2}{U}, Put a card an opponent owns from exile into that player's graveyard: Tap target creature."