Voltaic Key 
Artifact
$3.25 #1716 0.64 28.0 years
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Cards similar to Voltaic Key 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.
Voltaic Servant92%
$0.20↓#10361↓0.04↓8.5 years↓
"At the beginning of your end step, untap target artifact."
Elder Druid80%
$0.30↓#26621↓0.00↓31.4 years↑
"
,
: You may tap or untap target artifact, creature, or land."
Corridor Monitor80%
$0.10↓#9079↓0.15↓7.0 years↓
"When this creature enters, untap target artifact or creature you control."
Teferi, Timebender79%
$1.40↓#16975↓0.38↓8.5 years↓
"+2: Untap up to one target artifact or creature."
Janjeet Sentry78%
$0.08↓#22226↓0.17↓10.1 years↓
"
, Pay 
: You may tap or untap target artifact or creature."
Clock of Omens78%
$3.44↑#17010.98↑22.4 years↓
"Tap two untapped artifacts you control: Untap target artifact."
Unwinding Clock77%
$19.99↑#545↑1.36↑15.4 years↓
"Untap all artifacts you control during each other player's untap step."