Tend the Pests 

Instant
As an additional cost to cast this spell, sacrifice a creature.
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.
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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.
Pest Summoning 95%
$0.16#13263
"Create two 1/1 black and green Pest creature tokens with "When this token dies, you gain 1 life.""
Hunt for Specimens 95%
$0.11#17921
"Create a 1/1 black and green Pest creature token with "When this token dies, you gain 1 life.""
Eccentric Pestfinder // Turn Stones 91%
$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.""
Pest Rescuer 90%
$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.""
Beledros Witherbloom 87%
$1.43#1453
"At the beginning of each upkeep, create a 1/1 black and green Pest creature token with "When this token dies, you gain 1 life.""
Pestilent Cauldron // Restorative Burst 85%
$0.30#14660
"{T}, Discard a card: Create a 1/1 black and green Pest creature token with "When this token dies, you gain 1 life.""
Ribtruss Roaster 85%
$0.36#7938
"At the beginning of your end step, create a number of 1/1 black and green Pest creature tokens equal to the number of +1/+1 counters on this creature. They have "When this token dies, you gain 1 life.""
Sedgemoor Witch 84%
$6.45#2364
"Whenever you cast or copy an instant or sorcery spell, create a 1/1 black and green Pest creature token with "When this token dies, you gain 1 life.""
Mycoid Shepherd 84%
$0.37#26157
"Whenever this creature or another creature you control with power 5 or greater dies, you may gain 5 life."
Blight Mound 84%
$0.42#3968
"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.""
Sultai Flayer 83%
$0.10#23529
"Whenever a creature you control with toughness 4 or greater dies, you gain 4 life."
Bounty Board 81%
$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."
Valentin, Dean of the Vein // Lisette, Dean of the Root 80%
$1.01#7607
"If a nontoken creature an opponent controls would die, exile it instead. When you do, you may pay {2}. If you do, create a 1/1 black and green Pest creature token with "When this token dies, you gain 1 life.""
Tendrils of Despair 100%
$0.17#26489
"As an additional cost to cast this spell, sacrifice a creature."