Rex, Cyber-Hound 
Legendary Artifact Creature — Robot Dog
$0.27 #9981 0.36 2.6 years
Whenever Rex deals combat damage to a player, they mill two cards and you get 
(two energy counters).
(two energy counters).Pay : Choose target creature card in a graveyard. Exile it with a brain counter on it. Activate only as a sorcery.
: Choose target creature card in a graveyard. Exile it with a brain counter on it. Activate only as a sorcery.Rex has all activated abilities of all cards in exile with brain counters on them.
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Cards similar to Rex, Cyber-Hound 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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"
: Exile target card from a graveyard. When a creature card is exiled this way, put a +1/+1 counter on target creature you control."
: Exile target card from a graveyard. When a creature card is exiled this way, put a +1/+1 counter on target creature you control."+1 more matching line
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"
: Exile target creature card from your graveyard and put a +1/+1 counter on this creature."
: Exile target creature card from your graveyard and put a +1/+1 counter on this creature."+1 more matching line
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"Whenever this creature deals combat damage to a player, you get that many ."
."
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"This creature has all activated abilities of all cards exiled with it."
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"
: Exile target creature card from a graveyard. Put a +1/+1 counter on this creature."
: Exile target creature card from a graveyard. Put a +1/+1 counter on this creature."
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"Whenever one or more artifact creatures you control deal combat damage to a player, you get ."
."