Blight Mound 

Enchantment
Attacking Pests you control get +1/+0 and have menace.
Whenever a nontoken creature you control dies, create a 1/1 black and green Pest creature token with "When this token dies, you gain 1 life."
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Cards that do something similar 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.
Hunt for Specimens 88%
$0.11#17921
"Create a 1/1 black and green Pest creature token with "When this token dies, you gain 1 life.""
Kamber, the Plunderer 87%
$0.39#8081
"Whenever a creature an opponent controls dies, you gain 1 life and create a Blood token."
The Meathook Massacre 87%
$27.65#505
"Whenever a creature an opponent controls dies, you gain 1 life."
Eccentric Pestfinder // Turn Stones 87%
$0.36#8176
"For each opponent, you create a 1/1 black and green Pest creature token with "When this token dies, you gain 1 life.""
Sultai Flayer 85%
$0.10#23529
"Whenever a creature you control with toughness 4 or greater dies, you gain 4 life."
Gate to the Afterlife 85%
$0.20#11193
"Whenever a nontoken creature you control dies, you gain 1 life. Then you may draw a card. If you do, discard a card."
Bounty Board 84%
$2.06#5072
"Whenever a creature with a bounty counter on it dies, each of its controller's opponents draws a card and gains 2 life."
Tend the Pests 84%
$0.74#5419
"Create X 1/1 black and green Pest creature tokens with "When this token dies, you gain 1 life," where X is the sacrificed creature's power."
Pest Rescuer 83%
$0.89#7411
"At the beginning of each upkeep, if you don't control a Pest creature token, create a 1/1 black and green Pest creature token with "When this token dies, you gain 1 life.""
Kraven the Hunter 83%
$0.22#14434
"Whenever a creature an opponent controls with the greatest power among creatures that player controls dies, draw a card and put a +1/+1 counter on this card."
Callous Bloodmage 83%
$0.34#7775
"• Create a 1/1 black and green Pest creature token with "When this token dies, you gain 1 life.""
Altac Bloodseeker 82%
$0.05#28648
"Whenever a creature an opponent controls dies, this creature gets +2/+0 and gains first strike and haste until end of turn."
Garza Zol, Plague Queen 82%
$1.37#27702
"Whenever a creature dealt damage by this card this turn dies, put a +1/+1 counter on this card."
Pest Summoning 82%
$0.16#13263
"Create two 1/1 black and green Pest creature tokens with "When this token dies, you gain 1 life.""
Slimefoot, the Stowaway 81%
$0.18#5267
"Whenever a Saproling you control dies, this card deals 1 damage to each opponent and you gain 1 life."