Fog Elemental 
Creature — Elemental
$0.11 #29231 0.00 29.2 years
Flying (This creature can't be blocked except by creatures with flying or reach.)
When this creature attacks or blocks, sacrifice it at end of combat.
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Cards similar to Fog Elemental 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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"When this creature blocks, sacrifice it at end of combat."
+1 more matching line
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"When this creature attacks or blocks, destroy it at end of combat."
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"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
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"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
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"When this creature attacks or blocks, return it to its owner's hand at end of combat."
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"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
Clockwork Dragon90%
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"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
Phantom Whelp90%
$0.10↓#312390.0024.9 years↓
"When this creature attacks or blocks, return it to its owner's hand at end of combat."
Saprazzan Outrigger88%
$0.23↑#313480.55↑26.9 years↓
"When this creature attacks or blocks, put it on top of its owner's library at end of combat."
Wicker Warcrawler88%
$0.27↑#239280.29↑18.3 years↓
"Whenever this creature attacks or blocks, put a -1/-1 counter on it at end of combat."
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$0.18↑#314330.0025.9 years↓
"Flying"
Dorothea, Vengeful Victim // Dorothea's Retribution86%
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"When this card attacks or blocks, sacrifice it at end of combat."
Brackwater Elemental84%
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"When this creature attacks or blocks, sacrifice it at the beginning of the next end step."
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"When this creature attacks or blocks, return it to its owner's hand at end of combat."
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"Whenever this creature attacks or blocks, sacrifice it unless you exile a card from your graveyard."
Goblin Flotilla83%
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"At the beginning of each combat, unless you pay 
, whenever this creature blocks or becomes blocked by a creature this combat, that creature gains first strike until end of turn."
, whenever this creature blocks or becomes blocked by a creature this combat, that creature gains first strike until end of turn."
Goblin Elite Infantry82%
$0.06↓#301980.53↑29.9 years
"Whenever this creature blocks or becomes blocked, it gets -1/-1 until end of turn."