Rishadan Dockhand {U}
Creature — Merfolk
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
{1}, {T}: Tap target land.
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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.
Mana Leech 85%
$0.20#29836
"{T}: Tap target land. It doesn't untap during its controller's untap step for as long as this creature remains tapped."
Mole Worms 85%
$0.19#29646
"{T}: Tap target land. It doesn't untap during its controller's untap step for as long as this creature remains tapped."