Rakish Crew 

Enchantment
When this enchantment enters, create a 1/1 red Mercenary creature token with "{T}: Target creature you control gets +1/+0 until end of turn. Activate only as a sorcery."
Whenever an outlaw you control dies, each opponent loses 1 life and you gain 1 life. (Assassins, Mercenaries, Pirates, Rogues, and Warlocks are outlaws.)
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Cards that do something similar expected a card that isn't here?
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Lassoed by the Law 100%
$0.14#20954
"When this enchantment enters, create a 1/1 red Mercenary creature token with "{T}: Target creature you control gets +1/+0 until end of turn. Activate only as a sorcery.""
Bastion of Remembrance 89%
$0.30#332
"Whenever a creature you control dies, each opponent loses 1 life and you gain 1 life."
+1 more matching line
Grave Venerations 89%
$0.65#4678
"Whenever a creature you control dies, each opponent loses 1 life and you gain 1 life."
+1 more matching line
Funeral Room // Awakening Hall 89%
$5.17#2088
"Whenever a creature you control dies, each opponent loses 1 life and you gain 1 life."
Cauldron of Essence 89%
$2.57#3230
"Whenever a creature you control dies, each opponent loses 1 life and you gain 1 life."
Kardur, Doomscourge 88%
$1.77#969
"Whenever an attacking creature dies, each opponent loses 1 life and you gain 1 life."
Elderfang Venom 87%
$5.15#5627
"Whenever an Elf you control dies, each opponent loses 1 life and you gain 1 life."
Kheru Bloodsucker 87%
$0.11#21868
"Whenever a creature you control with toughness 4 or greater dies, each opponent loses 2 life and you gain 2 life."
Relic Vial 86%
$0.22#10203
"As long as you control a Cleric, this artifact has "Whenever a creature you control dies, each opponent loses 1 life and you gain 1 life.""
Vraan, Executioner Thane 83%
$0.76#4069
"Whenever one or more other creatures you control die, each opponent loses 2 life and you gain 2 life. This ability triggers only once each turn."
Boggart Mischief 83%
$0.29#11713
"Whenever a Goblin creature you control dies, each opponent loses 1 life and you gain 1 life."
Etched Familiar 82%
$0.14#16198
"When this creature dies, each opponent loses 2 life and you gain 2 life."
Nocturnal Feeder 82%
$0.25#20889
"When this creature dies, each opponent loses 2 life and you gain 2 life."
Symbiote Spawn 82%
$0.41#16365
"When this creature dies, each opponent loses 2 life and you gain 2 life."
Brotherhood Patriarch 82%
$0.16#14809
"When this creature dies, each opponent loses 2 life and you gain 2 life."
Spirit of Malevolence 81%
$0.23#25095
"When this creature dies, each opponent loses 1 life and you gain 1 life."
Cruel Celebrant 81%
$0.93#923
"Whenever this creature or another creature or planeswalker you control dies, each opponent loses 1 life and you gain 1 life."
Faerie Bladecrafter 81%
$4.65#5957
"When this creature dies, each opponent loses X life and you gain X life, where X is its power."
Zulaport Cutthroat 80%
$0.97#233
"Whenever this creature or another creature you control dies, each opponent loses 1 life and you gain 1 life."