Quicksilver Behemoth {6}{U}
Creature — Beast
Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
When this creature attacks or blocks, return it to its owner's hand at end of combat. (Return it only if it's on the battlefield.)
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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.
Phantom Whelp 100%
$0.10#30913
"When this creature attacks or blocks, return it to its owner's hand at end of combat."
Windscouter 100%
$0.13#31470
"When this creature attacks or blocks, return it to its owner's hand at end of combat."
Saprazzan Outrigger 84%
$0.18#31102
"When this creature attacks or blocks, put it on top of its owner's library at end of combat."
Ceremonial Guard 81%
$0.15#31568
"When this creature attacks or blocks, destroy it at end of combat."