Harsh Mercy 
Sorcery
$1.86 #8672 0.33 23.9 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%
$4.55↑#707↑0.64↑9.0 years↓
"Choose a creature type. Destroy all creatures that aren't of the chosen type."
Raise the Palisade82%
$5.22↑#932↑0.83↑3.2 years↓
"Choose a creature type. Return all creatures that aren't of the chosen type to their owners' hands."
Wrath of God80%
$2.97↑#667↑0.45↑33.1 years↑
"Destroy all creatures. They can't be regenerated."
Damnation80%
$16.80↑#384↑0.57↑19.6 years↓
"Destroy all creatures. They can't be regenerated."
Plague Wind78%
$2.50↑#6513↑0.46↑26.3 years↑
"Destroy all creatures you don't control. They can't be regenerated."
Winds of Rath77%
$0.31↓#1645↑0.45↑28.9 years↑
"Destroy all creatures that aren't enchanted. They can't be regenerated."
Consume the Meek76%
$0.19↓#19683↓0.10↓16.4 years↓
"Destroy each creature with mana value 3 or less. They can't be regenerated."
Endemic Plague76%
$0.24↓#28659↓0.06↓23.9 years
"Destroy all creatures that share a creature type with the sacrificed creature. They can't be regenerated."
Kirtar's Wrath75%
$0.21↓#13527↓0.08↓24.9 years↑
"Destroy all creatures. They can't be regenerated."
Breaking Point74%
$0.30↓#18807↓0.60↑24.3 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."
Perish74%
$0.39↓#22877↓0.3928.9 years↑
"Destroy all green creatures. They can't be regenerated."
Winnowing74%
$0.30↓#69740.00↓0.6 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."
Crippling Fear74%
$0.37↓#2025↑0.275.6 years↓
"Choose a creature type. Creatures that aren't of the chosen type get -3/-3 until end of turn."
Shatterstorm73%
$0.30↓#16822↓0.4032.5 years↑
"Destroy all artifacts. They can't be regenerated."
Damn73%
$2.03↑#345↑0.365.3 years↓
"Destroy target creature. A creature destroyed this way can't be regenerated."
Rout72%
$0.31↓#79840.4025.9 years↑
"Destroy all creatures. They can't be regenerated."
Catastrophe72%
$2.91↑#12384↓1.83↑27.9 years↑
"Destroy all lands or all creatures. Creatures destroyed this way can't be regenerated."
Jokulhaups72%
$5.47↑#11332↓2.36↑31.3 years↑
"Destroy all artifacts, creatures, and lands. They can't be regenerated."
Flesh to Dust72%
$0.04↓#25633↓0.06↓12.1 years↓
"Destroy target creature. It can't be regenerated."
Terminate72%
$0.30↓#224↑0.19↓25.6 years↑
"Destroy target creature. It can't be regenerated."