Fog Elemental 
Creature — Elemental
$0.09 #29554 0.05 29.4 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.
Mardu Blazebringer100%
$0.04↓#310030.0012.1 years↓
"When this creature attacks or blocks, sacrifice it at end of combat."
Ceremonial Guard96%
$0.04↓#321910.0027.0 years↓
"When this creature attacks or blocks, destroy it at end of combat."
Runaway Carriage95%
$0.06↓#285740.0010.5 years↓
"When this creature attacks or blocks, sacrifice it at end of combat."
Stoic Ephemera95%
$0.10↑#280100.0020.5 years↓
"When this creature blocks, sacrifice it at end of combat."
Vebulid94%
$0.73↑#264830.0628.0 years↓
"When this creature attacks or blocks, destroy it at end of combat."
Clockwork Condor92%
$0.06↓#267130.0023.0 years↓
"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
Clockwork Beetle92%
$0.13↑#20244↑0.0523.0 years↓
"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
Windscouter90%
$0.15↑#320090.0626.4 years↓
"When this creature attacks or blocks, return it to its owner's hand at end of combat."
Clockwork Vorrac90%
$0.11↑#253380.31↑23.0 years↓
"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
Clockwork Dragon90%
$0.36↑#21368↑0.16↑23.0 years↓
"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
Phantom Whelp90%
$0.09#315380.0025.1 years↓
"When this creature attacks or blocks, return it to its owner's hand at end of combat."
Saprazzan Outrigger88%
$0.19↑#316710.0027.0 years↓
"When this creature attacks or blocks, put it on top of its owner's library at end of combat."
Wicker Warcrawler88%
$0.25↑#243490.0018.5 years↓
"Whenever this creature attacks or blocks, put a -1/-1 counter on it at end of combat."
Dorothea, Vengeful Victim // Dorothea's Retribution85%
$0.28↑#15546↑0.17↑4.9 years↓
"When this card attacks or blocks, sacrifice it at end of combat."
Brackwater Elemental85%
$0.09#297560.0017.7 years↓
"When this creature attacks or blocks, sacrifice it at the beginning of the next end step."
Quicksilver Behemoth83%
$0.24↑#278010.0022.7 years↓
"When this creature attacks or blocks, return it to its owner's hand at end of combat."
Rotting Giant83%
$0.33↑#314680.0025.1 years↓
"Whenever this creature attacks or blocks, sacrifice it unless you exile a card from your graveyard."
Goblin Flotilla83%
$0.77↑#307950.19↑32.0 years↑
"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%
$0.09#303910.0030.0 years
"Whenever this creature blocks or becomes blocked, it gets -1/-1 until end of turn."
Time Elemental82%
$0.41↑#272920.1232.4 years↑
"When this creature attacks or blocks, at end of combat, sacrifice it and it deals 5 damage to you."