Component Collector {2}{U}
Creature — Homunculus
If it's neither day nor night, it becomes day as this creature enters.
Whenever day becomes night or night becomes day, you may tap or untap target nonland permanent.
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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.
Stinging Lionfish 96%
$0.08#14066
"Whenever you cast your first spell during each opponent's turn, you may tap or untap target nonland permanent."
Merrow Reejerey 89%
$0.24#3998
"Whenever you cast a Merfolk spell, you may tap or untap target permanent."
Telekinetic Bonds 88%
$0.33#28251
"Whenever a player discards a card, you may pay {1}{U}. If you do, you may tap or untap target permanent."
Tidal Force 88%
$0.48#16453
"At the beginning of each upkeep, you may tap or untap target permanent."
Toils of Night and Day 87%
$0.17#17859
"You may tap or untap target permanent, then you may tap or untap another target permanent."
Hidden Strings 87%
$0.25#4303
"You may tap or untap target permanent, then you may tap or untap another target permanent."
Curse of Inertia 83%
$0.40#14928
"Whenever a player attacks enchanted player with one or more creatures, that attacking player may tap or untap target permanent of their choice."
Coral Trickster 82%
$0.16#22227
"When this creature is turned face up, you may tap or untap target permanent."
Esper Sojourners 80%
$0.08#25292
"When you cycle this card and when this creature dies, you may tap or untap target permanent."
Sunstreak Phoenix 100%
$0.27#20361
"If it's neither day nor night, it becomes day as this creature enters."
Sunrise Cavalier 100%
$0.08#26096
"If it's neither day nor night, it becomes day as this creature enters."
+1 more matching line
Brimstone Vandal 100%
$0.09#23482
"If it's neither day nor night, it becomes day as this creature enters."
Celestus Sanctifier 100%
$0.04#29961
"If it's neither day nor night, it becomes day as this creature enters."
Gavony Dawnguard 100%
$0.07#25178
"If it's neither day nor night, it becomes day as this creature enters."
+1 more matching line
Obsessive Astronomer 100%
$0.13#24789
"If it's neither day nor night, it becomes day as this creature enters."