Gustha's Scepter 
Artifact
$6.45 #12967 0.00 30.4 years
: Exile a card from your hand face down. You may look at it for as long as it remains exiled.: Return a card you own exiled with this artifact to your hand.When you lose control of this artifact, put all cards exiled with this artifact into their owner's graveyard.
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Cards similar to Gustha's Scepter 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.
Bottled Cloister77%
$0.23↓#21802↓0.0021.0 years↓
"At the beginning of your upkeep, return all cards you own exiled with this artifact to your hand, then draw a card."
+1 more matching line
Bag of Holding70%
$0.24↓#4042↑0.037.3 years↓
"
, , Sacrifice this artifact: Return all cards exiled with this artifact to their owner's hand."
, , Sacrifice this artifact: Return all cards exiled with this artifact to their owner's hand."+1 more matching line