Scrib Nibblers {2}{B}
Creature — Rat
{T}: Exile the top card of target player's library. If it's a land card, you gain 1 life.
Landfall — Whenever a land you control enters, you may untap this 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.
Tideforce Elemental 100%
$0.29#14226
"Whenever a land you control enters, you may untap this creature."
Stone-Seeder Hierophant 99%
$0.47#10020
"Whenever a land you control enters, untap this creature."
+1 more matching line
Moraug, Fury of Akoum 88%
$2.19#996
"Whenever a land you control enters, if it's your main phase, there's an additional combat phase after this phase. At the beginning of that combat, untap all creatures you control."
Woodcaller Automaton 86%
$0.20#19457
"When this creature enters, if you cast it, untap target land you control. It becomes a Treefolk creature with haste and base power and toughness equal to this creature's power and toughness. It's still a land."