Amzu, Swarm's Hunger 
Legendary Creature — Insect Shaman
$18.05 #7823 0.29 2.5 years
Flying, menace
Other Insects you control have menace.
Whenever one or more cards leave your graveyard, you may create a 1/1 black and green Insect creature token, then put a number of +1/+1 counters on it equal to the greatest mana value among those cards. Do this only once each turn.
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Cards similar to Amzu, Swarm's Hunger 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.
Goblin War Drums80%
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"Creatures you control have menace."
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"Whenever one or more cards leave your graveyard, create a 2/2 red and white Spirit creature token."
+1 more matching line
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"Creatures you control have menace."
Attuned Hunter77%
$0.17↓#20127↓0.13↓1.4 years↓
"Whenever one or more cards leave your graveyard during your turn, put a +1/+1 counter on this creature."
On Wings of Gold76%
$0.67↓#3637↑0.201.6 years
"Whenever one or more cards leave your graveyard, create a 1/1 white Zombie creature token."
Quintorius, Field Historian76%
$0.18↓#92980.195.4 years↑
"Whenever one or more cards leave your graveyard, create a 3/2 red and white Spirit creature token."
Dinotomaton74%
$0.14↓#18143↓0.50↑2.8 years
"Menace"
Spirit Mascot74%
$0.11↓#19367↓0.00↓0.4 years↓
"Whenever one or more cards leave your graveyard, put a +1/+1 counter on this creature."
Teval, the Balanced Scale74%
$4.81↓#2690↑0.60↑1.4 years↓
"Whenever one or more cards leave your graveyard, create a 2/2 black Zombie Druid creature token."
Defiled Crypt // Cadaver Lab74%
$0.27↓#5631↑0.10↓1.9 years
"Whenever one or more cards leave your graveyard, create a 2/2 black Horror enchantment creature token. This ability triggers only once each turn."
Warg Rider74%
$30.56↑#64310.00↓2.8 years
"Other Orcs and Goblins you control have menace."
+1 more matching line
Imotekh the Stormlord74%
$11.30↓#4902↑0.283.9 years↑
"Whenever one or more artifact cards leave your graveyard, create two 2/2 black Necron Warrior artifact creature tokens."
Tormod, the Desecrator73%
$1.25↓#3618↑0.09↓5.8 years↑
"Whenever one or more cards leave your graveyard, create a tapped 2/2 black Zombie creature token."
Belligerent Sliver73%
$0.50↓#12395↓0.44↑12.1 years↑
"Sliver creatures you control have menace."
Chittering Host72%
10.1 years↑
"Menace"
+1 more matching line
Quintorius, History Chaser72%
$0.38↓#9641↓0.00↓0.4 years↓
"Whenever one or more cards leave your graveyard, create a 3/2 red and white Spirit creature token."
Great Ugly-Looking Goblin // Clap! Snap!72%
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"Each creature you control with a +1/+1 counter on it has menace."
Camellia, the Seedmiser72%
$2.44↓#2639↑0.372.1 years
"Other Squirrels you control have menace."
+1 more matching line
Gruul War Chant72%
$0.20↓#66420.45↑13.3 years↑
"Attacking creatures you control get +1/+0 and have menace."
Grim Reaper's Scythe72%
$0.32↓#19263↓0.00↓0.2 years↓
"Whenever one or more creature cards leave your graveyard, create a 2/2 black Zombie creature token."