Brass Gnat 
Artifact Creature — Insect
$0.08 #23166 0.27 19.9 years
Flying
This creature doesn't untap during your untap step.
At the beginning of your upkeep, you may pay
. If you do, untap this creature.
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Cards similar to Brass Gnat 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.
Brass Man100%
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"At the beginning of your upkeep, you may pay
. If you do, untap this creature."
+1 more matching line
Goblin War Wagon98%
$0.05↓#30411↓0.40↑22.9 years↑
"At the beginning of your upkeep, you may pay
. If you do, untap this creature."
+1 more matching line
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$0.10↑#31190↓0.00↓22.9 years↑
"At the beginning of your upkeep, you may pay
. If you do, untap this creature."
+1 more matching line
Colossus of Sardia94%
$0.24↑#231070.2732.5 years↑
"
: Untap this creature. Activate only during your upkeep."
+1 more matching line
Island Fish Jasconius90%
$0.32↑#265710.42↑32.7 years↑
"At the beginning of your upkeep, you may pay 

. If you do, untap this creature."
+1 more matching line
Mana Vault90%
$87.31↑#146↑1.63↑33.1 years↑
"At the beginning of your upkeep, you may pay
. If you do, untap this artifact."
+1 more matching line
Lurking Roper86%
$0.07↓#248640.47↑5.1 years↓
"Whenever you gain life, untap this creature."
+1 more matching line
Dormant Gomazoa86%
$0.26↑#27887↓0.12↓16.4 years↓
"Whenever you become the target of a spell, you may untap this creature."
+1 more matching line
Alirios, Enraptured86%
$0.18↑#223950.06↓6.6 years↓
"this card doesn't untap during your untap step if you control a Reflection."
Famished Paladin86%
$0.32↑#15586↑0.298.6 years↓
"Whenever you gain life, untap this creature."
+1 more matching line
Traxos, Scourge of Kroog86%
$0.36↑#3947↑0.39↑8.4 years↓
"this card enters tapped and doesn't untap during your untap step."
Deep-Slumber Titan84%
$0.24↑#260360.2718.3 years↓
"Whenever this creature is dealt damage, untap it."
+1 more matching line
Walking Dream84%
$0.22↑#31568↓0.00↓28.5 years↑
"This creature doesn't untap during your untap step if an opponent controls two or more creatures."