Cloudstone Curio 
Artifact
$11.74 #2639 0.90 20.9 years
Whenever a nonartifact permanent you control enters, you may return another permanent you control that shares a permanent type with it to its owner's hand.
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Cards similar to Cloudstone Curio 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.
Cache Raiders72%
$0.15↓#27907↓0.06↓18.1 years↓
"At the beginning of your upkeep, return a permanent you control to its owner's hand."
Amareth, the Lustrous71%
$0.38↓#11767↓0.29↓5.8 years↓
"Whenever another permanent you control enters, look at the top card of your library. If it shares a card type with that permanent, you may reveal that card and put it into your hand."