Harsh Mercy 
Sorcery
$1.63 #8887 0.21 24.0 years
Each player chooses a creature type. Destroy all creatures that aren't of a type chosen this way. They can't be regenerated.
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Cards similar to Harsh Mercy 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.
Kindred Dominance90%
$4.67↑#697↑0.70↑9.2 years↓
"Choose a creature type. Destroy all creatures that aren't of the chosen type."
Raise the Palisade82%
$4.63↑#868↑0.93↑3.3 years↓
"Choose a creature type. Return all creatures that aren't of the chosen type to their owners' hands."
Wrath of God80%
$3.27↑#687↑0.56↑33.2 years↑
"Destroy all creatures. They can't be regenerated."
Damnation80%
$17.37↑#391↑0.66↑19.7 years↓
"Destroy all creatures. They can't be regenerated."
Kindred Judgment80%
$1.38↓#11841↓0.58↑0.0 years↓
"Choose a creature type. Destroy all creatures that aren't of the chosen type."
Plague Wind78%
$2.61↑#6575↑0.56↑26.4 years↑
"Destroy all creatures you don't control. They can't be regenerated."
Winds of Rath77%
$0.33↓#1692↑0.53↑29.0 years↑
"Destroy all creatures that aren't enchanted. They can't be regenerated."
Consume the Meek76%
$0.16↓#19951↓0.2016.5 years↓
"Destroy each creature with mana value 3 or less. They can't be regenerated."
Endemic Plague76%
$0.25↓#28857↓0.40↑24.0 years
"Destroy all creatures that share a creature type with the sacrificed creature. They can't be regenerated."
Kirtar's Wrath75%
$0.22↓#13826↓0.42↑25.1 years↑
"Destroy all creatures. They can't be regenerated."
Breaking Point74%
$0.27↓#19138↓0.2524.4 years
"Any player may have this card deal 6 damage to them. If no one does, destroy all creatures. Creatures destroyed this way can't be regenerated."
Crippling Fear74%
$0.40↓#2065↑0.42↑5.7 years↓
"Choose a creature type. Creatures that aren't of the chosen type get -3/-3 until end of turn."
Winnowing73%
$0.33↓#6521↑0.33↑0.7 years↓
"For each player, you choose a creature that player controls. Then each player sacrifices all other creatures they control that don't share a creature type with the chosen creature they control."
Shatterstorm73%
$0.30↓#17149↓0.64↑32.6 years↑
"Destroy all artifacts. They can't be regenerated."
Perish72%
$0.40↓#23105↓1.05↑29.0 years↑
"Destroy all green creatures. They can't be regenerated."
Damn72%
$1.76↑#348↑0.43↑5.5 years↓
"Destroy target creature. A creature destroyed this way can't be regenerated."
Rout72%
$0.30↓#81570.71↑26.0 years↑
"Destroy all creatures. They can't be regenerated."
Catastrophe72%
$3.18↑#12635↓2.00↑28.0 years↑
"Destroy all lands or all creatures. Creatures destroyed this way can't be regenerated."
Jokulhaups72%
$5.62↑#11537↓2.59↑31.4 years↑
"Destroy all artifacts, creatures, and lands. They can't be regenerated."
Terminate72%
$0.27↓#227↑0.2025.7 years↑
"Destroy target creature. It can't be regenerated."