Gathering Stone 
Artifact
$0.44 #3079 0.10 0.7 years
As this artifact enters, choose a creature type.
Spells you cast of the chosen type cost 
less to cast.
less to cast.When this artifact enters and at the beginning of your upkeep, look at the top card of your library. If it's a card of the chosen type, you may reveal it and put it into your hand. If you don't put the card into your hand, you may put it into your graveyard.
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Cards similar to Gathering Stone 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.
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"Creature spells you cast of the chosen type cost less to cast."
less to cast."+2 more matching lines
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"Creature spells of the chosen type cost 
less to cast."
less to cast."+1 more matching line
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"As this artifact enters, choose a creature type."
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"Whenever an artifact you control enters, look at the top card of your library. If it's a land card, you may reveal it and put it into your hand. If you don't put the card into your hand, you may put it into your graveyard."
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"Whenever a land you control enters, look at the top card of your library. If it's a creature card, you may reveal it and put it into your hand. If you don't put the card into your hand, you may put it into your graveyard."
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"Creature spells you cast cost less to cast."
less to cast."+1 more matching line
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$0.25↓#14701↓0.27↑1.5 years
"Whenever this creature becomes tapped, look at the top card of your library. If it's a land card, you may reveal it and put it into your hand. If you don't put the card into your hand, you may put it into your graveyard."
Belbe's Portal78%
$1.15↑#12745↓0.47↑26.7 years↑
"As this artifact enters, choose a creature type."
Sibsig Appraiser77%
$0.10↓#18755↓0.161.5 years
"When this creature enters, look at the top two cards of your library. Put one of them into your hand and the other into your graveyard."
Instruments of War77%
$0.37↓#14293↓0.31↑3.9 years↑
"As this artifact enters, choose a creature type."
Tower Geist76%
$0.04↓#24920↓0.0514.7 years↑
"When this creature enters, look at the top two cards of your library. Put one of them into your hand and the other into your graveyard."
Mirror of the Forebears76%
$1.81↑#10612↓0.129.2 years↑
"As this artifact enters, choose a creature type."
Reflections of Littjara76%
$1.70↑#694↑0.51↑5.7 years↑
"As this enchantment enters, choose a creature type."
Rally the Ranks76%
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"As this enchantment enters, choose a creature type."
Organ Hoarder76%
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"When this creature enters, look at the top three cards of your library, then put one of them into your hand and the rest into your graveyard."
Sultai Soothsayer76%
$0.07↓#25497↓0.24↑12.1 years↑
"When this creature enters, look at the top four cards of your library. Put one of them into your hand and the rest into your graveyard."
Adaptive Automaton75%
$0.43↓#1782↑0.1415.3 years↑
"As this creature enters, choose a creature type."
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"Creature spells you cast cost less to cast."
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"As this artifact enters, choose a creature type."